diff --git a/VERSION b/VERSION
index 3f05c4a..565bcc8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.4.78-beta
+0.4.79-beta
diff --git a/public/js/core.js b/public/js/core.js
index d515853..3e0135e 100644
--- a/public/js/core.js
+++ b/public/js/core.js
@@ -2,7 +2,7 @@
 "use strict";
 /* version — shown until /api/version resolves (or if the fetch fails, e.g. offline).
    Kept in sync by hand with the VERSION file at the repo root on every release. */
-const VERSION = "0.4.78-beta";
+const VERSION = "0.4.79-beta";
 /* Safari en oudere mobiele browsers behandelen 100vh/100% soms als de hoogte
    achter hun adres- en navigatiebalk. visualViewport geeft de werkelijk
    zichtbare hoogte; de CSS gebruikt deze pixelwaarde als betrouwbare bron en
diff --git a/public/js/widgets/coloring-scenes-advanced.js b/public/js/widgets/coloring-scenes-advanced.js
index 217b0eb..6f0c4c5 100644
--- a/public/js/widgets/coloring-scenes-advanced.js
+++ b/public/js/widgets/coloring-scenes-advanced.js
@@ -5,60 +5,81 @@
 "use strict";
 
 function plateSeasons(){
-  /* één boom, vier seizoenen: de kroon is in vier kwarten verdeeld en de grond
-     eronder loopt mee, van links (lente) naar rechts (winter) */
-  /* de kroon is een cirkel in vier kwarten: linksonder lente, linksboven zomer,
-     rechtsboven herfst, rechtsonder winter. De grond eronder loopt in vier
-     banen mee, dus de plaat leest van links naar rechts als een jaar. */
+  /* vier eigen boompjes naast elkaar - één per seizoen - in plaats van één
+     cirkel in kwarten: dat las als een bal met een kruis erdoorheen. Zo
+     draagt elke boom zijn eigen seizoen (bloesem, blad, herfstkleur, kale
+     takken met sneeuw) en is de volgorde meteen duidelijk. */
+  const cy=200;
+  const seasonCrown=(cx)=>{
+    const n=coloringRound;
+    return `M ${n(cx)} ${n(cy-64)} C ${n(cx+34)} ${n(cy-64)} ${n(cx+60)} ${n(cy-42)} ${n(cx+62)} ${n(cy-11)}`+
+      ` C ${n(cx+83)} ${n(cy-4)} ${n(cx+81)} ${n(cy+26)} ${n(cx+59)} ${n(cy+38)}`+
+      ` C ${n(cx+64)} ${n(cy+60)} ${n(cx+38)} ${n(cy+72)} ${n(cx+11)} ${n(cy+64)}`+
+      ` C ${n(cx+4)} ${n(cy+75)} ${n(cx-19)} ${n(cy+75)} ${n(cx-29)} ${n(cy+64)}`+
+      ` C ${n(cx-53)} ${n(cy+69)} ${n(cx-75)} ${n(cy+53)} ${n(cx-71)} ${n(cy+26)}`+
+      ` C ${n(cx-86)} ${n(cy+15)} ${n(cx-83)} ${n(cy-15)} ${n(cx-60)} ${n(cy-23)}`+
+      ` C ${n(cx-53)} ${n(cy-49)} ${n(cx-26)} ${n(cy-64)} ${n(cx)} ${n(cy-64)} Z`;
+  };
+  const trunk=(cx)=>`M ${cx-16} 452 C ${cx-14} 400 ${cx-12} 340 ${cx-10} 270 L ${cx+10} 270 C ${cx+12} 340 ${cx+14} 400 ${cx+16} 452 Z`;
   return coloringScene("four-seasons",
     coloringBackdrop("sky","#3b7dd8")+
-    coloringFlat("ground-spring","M 4 452 C 70 442 140 448 200 456 L 200 596 L 4 596 Z","#3fae6a")+
-    coloringFlat("ground-summer","M 200 456 C 260 462 340 456 400 448 L 400 596 L 200 596 Z","#f7c948")+
-    coloringFlat("ground-autumn","M 400 448 C 460 440 540 446 600 454 L 600 596 L 400 596 Z","#f28c3c")+
-    coloringFlat("ground-winter","M 600 454 C 660 460 730 454 796 446 L 796 596 L 600 596 Z","#ffffff")+
-    coloringGroup("tree",
-      coloringContour("trunk","M 344 452 C 356 400 364 340 366 250 L 434 250 C 436 340 444 400 456 452 Z","#8b5a3c")+
-      /* geschulpte buitenrand per kwart: een gladde cirkel las als een bal in
-         plaats van als bladerdek */
-      coloringContour("crown-summer","M 400 210 L 250 210 C 240 186 240 160 258 140 C 276 118 300 112 320 92 C 340 70 372 56 400 60 Z","#3fae6a")+
-      coloringContour("crown-autumn","M 400 210 L 400 60 C 428 56 460 70 480 92 C 500 112 524 118 542 140 C 560 160 560 186 550 210 Z","#f28c3c")+
-      coloringContour("crown-spring","M 400 210 L 400 360 C 372 364 340 350 320 328 C 300 308 276 302 258 280 C 240 260 240 234 250 210 Z","#d85aa5")+
-      coloringContour("crown-winter","M 400 210 L 550 210 C 560 234 560 260 542 280 C 524 302 500 308 480 328 C 460 350 428 364 400 360 Z","#2fb7a8")+
-      /* ronde plukken in plaats van losse spitse blaadjes: die lazen als ogen
-         of los tegen de rand geplakte snippers. Alle plukken staan ruim
-         binnen hun kwart, niet op de scheidslijnen, en in drie maten zodat
-         ze niet als een paar ogen naast elkaar staan */
-      coloringGroup("tree-detail",
-        coloringCircle("blossom-a",300,270,20,"#ffffff")+
-        coloringCircle("blossom-b",340,318,16,"#ffffff")+
-        coloringCircle("blossom-c",278,310,13,"#ffffff")+
-        coloringCircle("leaf-a",294,130,20,"#f7c948")+
-        coloringCircle("leaf-b",340,102,15,"#f7c948")+
-        coloringCircle("leaf-c",460,124,19,"#e0554d")+
-        coloringCircle("leaf-d",500,158,14,"#e0554d")+
-        coloringCircle("snow-clump",470,270,20,"#ffffff")+
-        coloringCircle("snow-clump-b",506,308,14,"#ffffff")+
-        coloringFlat("trunk-knot","M 384 372 C 396 362 412 362 420 372 C 412 386 396 386 384 372 Z","#f2b38f")+
-        coloringFlat("hollow","M 386 418 C 396 406 410 406 418 418 C 410 434 396 434 386 418 Z","#26344a"),2)+
-      coloringLine("M 376 392 C 394 384 410 384 426 392 M 372 424 C 390 416 408 416 424 424",2)+
-      coloringLine("M 400 60 L 400 360 M 250 210 L 550 210",3))+
-    coloringGroup("season-props",
-      coloringContour("tulip-cup","M 78 448 C 78 424 90 408 108 408 C 126 408 138 424 138 448 C 122 458 94 458 78 448 Z","#e0554d")+
-      coloringFlat("tulip-stem","M 100 526 C 96 500 96 474 100 448 L 116 448 C 112 474 112 500 116 526 Z","#3fae6a")+
-      coloringFlat("sunflower-petal-a",coloringPetalPath(268,486,-90,48,20),"#f7c948")+
-      coloringFlat("sunflower-petal-b",coloringPetalPath(268,486,-18,48,20),"#f7c948")+
-      coloringFlat("sunflower-petal-c",coloringPetalPath(268,486,54,48,20),"#f7c948")+
-      coloringFlat("sunflower-petal-d",coloringPetalPath(268,486,126,48,20),"#f7c948")+
-      coloringFlat("sunflower-petal-e",coloringPetalPath(268,486,198,48,20),"#f7c948")+
-      coloringCircle("sunflower-core",268,486,26,"#8b5a3c","coloring-contour")+
-      coloringFlat("pumpkin","M 484 552 C 484 518 508 498 540 498 C 572 498 596 518 596 552 C 596 578 572 590 540 590 C 508 590 484 578 484 552 Z","#f28c3c")+
-      coloringGroup("season-props-detail",
-        coloringFlat("pumpkin-stem","M 532 498 C 532 484 536 474 546 468 C 552 480 550 492 546 500 Z","#3fae6a")+
-        coloringLine("M 512 506 C 506 528 506 566 512 584 M 568 506 C 574 528 574 566 568 584",2)+
-        coloringFlat("snowman-body","M 668 552 C 668 526 686 508 710 508 C 734 508 752 526 752 552 C 752 576 734 588 710 588 C 686 588 668 576 668 552 Z","#ffffff")+
-        coloringCircle("snowman-head",710,478,32,"#ffffff")+
-        coloringDot(700,472,5)+coloringDot(720,472,5),2)+
-      coloringLine("M 108 526 C 128 508 148 500 166 498 M 268 512 C 264 542 264 566 268 586",3))
+    coloringFlat("ground-spring","M 4 452 C 54 446 100 448 200 452 L 200 596 L 4 596 Z","#3fae6a")+
+    coloringFlat("ground-summer","M 200 452 C 250 448 350 448 400 452 L 400 596 L 200 596 Z","#f7c948")+
+    coloringFlat("ground-autumn","M 400 452 C 450 448 550 448 600 452 L 600 596 L 400 596 Z","#f28c3c")+
+    coloringFlat("ground-winter","M 600 452 C 650 448 746 448 796 452 L 796 596 L 600 596 Z","#ffffff")+
+    coloringGroup("spring-tree",
+      coloringContour("spring-trunk",trunk(102),"#8b5a3c")+
+      coloringContour("spring-crown",seasonCrown(102),"#d85aa5")+
+      coloringGroup("spring-detail",
+        coloringCircle("spring-leaf-a",70,190,16,"#3fae6a")+
+        coloringCircle("spring-leaf-b",130,165,13,"#3fae6a")+
+        coloringCircle("spring-leaf-c",100,235,12,"#3fae6a"),2)+
+      coloringGroup("spring-ground",
+        coloringFlat("spring-flower-stem","M 46 486 C 44 470 44 456 46 444 L 54 444 C 56 456 56 470 54 486 Z","#3fae6a")+
+        coloringCircle("spring-flower-heart",50,432,12,"#f7c948")+
+        coloringCircle("spring-petal-a",50,414,9,"#d85aa5")+coloringCircle("spring-petal-b",66,432,9,"#d85aa5")+
+        coloringCircle("spring-petal-c",50,450,9,"#d85aa5")+coloringCircle("spring-petal-d",34,432,9,"#d85aa5"),2))+
+    coloringGroup("summer-tree",
+      coloringContour("summer-trunk",trunk(300),"#8b5a3c")+
+      coloringContour("summer-crown",seasonCrown(300),"#3fae6a")+
+      coloringGroup("summer-detail",
+        coloringCircle("summer-leaf-a",270,182,17,"#2fb7a8")+
+        coloringCircle("summer-leaf-b",332,168,14,"#2fb7a8")+
+        coloringCircle("summer-leaf-c",300,230,13,"#2fb7a8")+
+        coloringCircle("summer-fruit-a",256,222,8,"#e0554d")+coloringCircle("summer-fruit-b",320,205,8,"#e0554d"),2)+
+      coloringGroup("summer-ground",
+        coloringLine("M 244 486 C 240 462 244 444 254 428 M 260 490 C 258 464 262 446 272 430 M 276 486 C 274 462 280 446 290 432")+
+        coloringCircle("summer-tuft-a",258,470,10,"#3fae6a")+coloringCircle("summer-tuft-b",274,478,9,"#3fae6a"),2))+
+    coloringGroup("autumn-tree",
+      coloringContour("autumn-trunk",trunk(500),"#8b5a3c")+
+      coloringContour("autumn-crown",seasonCrown(500),"#f28c3c")+
+      coloringGroup("autumn-detail",
+        coloringCircle("autumn-leaf-a",470,186,17,"#e0554d")+
+        coloringCircle("autumn-leaf-b",532,170,14,"#f7c948")+
+        coloringCircle("autumn-leaf-c",500,232,13,"#e0554d"),2)+
+      coloringGroup("autumn-ground",
+        coloringFlat("autumn-leaf-drop-a","M 444 470 C 456 460 472 462 478 474 C 466 486 450 486 444 470 Z","#e0554d")+
+        coloringFlat("autumn-leaf-drop-b","M 466 494 C 478 486 492 488 496 500 C 486 510 472 510 466 494 Z","#f7c948"),2))+
+    coloringGroup("winter-tree",
+      coloringContour("winter-trunk",trunk(698),"#8b5a3c")+
+      /* geen bladerkroon: drie echte, gevulde takken (geen dunne lijnen die
+         vanuit één punt uitwaaieren - dat las als vuurwerk) met dunne twijgjes
+         en sneeuwklompjes op de uiteinden */
+      coloringFlat("winter-branch-left",coloringPetalPath(698,278,-130,85,14),"#8b5a3c")+
+      coloringFlat("winter-branch-mid",coloringPetalPath(698,278,-90,95,13),"#8b5a3c")+
+      coloringFlat("winter-branch-right",coloringPetalPath(698,278,-50,85,14),"#8b5a3c")+
+      coloringLine("M 643 213 L 613 196 M 643 213 L 637 179 M 698 183 L 685 147 M 698 183 L 711 147"+
+        " M 753 213 L 759 179 M 753 213 L 783 196")+
+      coloringGroup("winter-snow",
+        coloringCircle("snow-tip-a",613,196,11,"#ffffff")+coloringCircle("snow-tip-b",637,179,10,"#ffffff")+
+        coloringCircle("snow-tip-c",685,147,11,"#ffffff")+coloringCircle("snow-tip-d",711,147,10,"#ffffff")+
+        coloringCircle("snow-tip-e",759,179,11,"#ffffff")+coloringCircle("snow-tip-f",783,196,10,"#ffffff")+
+        coloringCircle("snow-crook",698,278,10,"#ffffff"))+
+      coloringLine("M 690 230 C 694 246 696 262 698 278 M 706 230 C 704 246 702 262 700 278",3)+
+      coloringGroup("winter-ground",
+        coloringCircle("snowman-body",668,478,20,"#ffffff")+
+        coloringCircle("snowman-head",668,448,14,"#ffffff")+
+        coloringDot(663,444,3)+coloringDot(673,444,3),2))
   );
 }
 
@@ -70,11 +91,13 @@ function plateEcoCity(){
     coloringFlat("far-hills","M 4 328 C 120 282 220 322 320 296 C 410 272 480 308 560 292 C 650 274 720 306 796 292 L 796 372 L 4 372 Z","#2fb7a8")+
     coloringFlat("street","M 4 492 L 796 492 L 796 596 L 4 596 Z","#26344a")+
     coloringFlat("park","M 4 372 L 796 372 L 796 492 L 4 492 Z","#3fae6a")+
+    /* drie wieken precies 120 graden uit elkaar: eerder stonden ze scheef
+       (twee dicht bij elkaar, één ver weg), waardoor het geen molen leek */
     coloringGroup("turbines",
       coloringFlat("turbine-mast","M 128 372 L 148 372 L 142 176 L 134 176 Z","#ffffff")+
-      coloringFlat("turbine-blade-a","M 138 176 L 146 168 L 236 108 L 240 124 Z","#ffffff")+
-      coloringFlat("turbine-blade-b","M 138 176 L 130 170 L 60 244 L 74 252 Z","#ffffff")+
-      coloringFlat("turbine-blade-c","M 138 176 L 146 182 L 168 284 L 152 286 Z","#ffffff")+
+      coloringFlat("turbine-blade-a",coloringPetalPath(138,176,-50,112,15),"#ffffff")+
+      coloringFlat("turbine-blade-b",coloringPetalPath(138,176,70,112,15),"#ffffff")+
+      coloringFlat("turbine-blade-c",coloringPetalPath(138,176,190,112,15),"#ffffff")+
       coloringCircle("turbine-hub",138,176,13,"#26344a","coloring-contour"))+
     coloringGroup("tower-block",
       coloringContour("tower","M 296 492 L 296 196 L 412 196 L 412 492 Z","#f2b38f")+
diff --git a/public/js/widgets/coloring-scenes-middle.js b/public/js/widgets/coloring-scenes-middle.js
index 4dd5b7e..dbe131e 100644
--- a/public/js/widgets/coloring-scenes-middle.js
+++ b/public/js/widgets/coloring-scenes-middle.js
@@ -162,35 +162,34 @@ function plateDinosaur(){
     coloringGroup("ferns",
       coloringFlat("fern-left","M 64 552 C 46 500 66 452 104 424 C 116 464 112 508 90 546 C 84 556 72 558 64 552 Z","#2fb7a8")+
       coloringFlat("fern-right","M 712 548 C 694 496 714 448 752 420 C 764 460 760 504 738 542 C 732 552 720 554 712 548 Z","#2fb7a8"))+
-    /* volledig hertekend: een gracieuze S-hals met een echte snuit in plaats
-       van een rechte staaf met een los blokje erboven, en vier duidelijk
-       gescheiden poten met elk een eigen voet in plaats van twee brede
-       lapjes die als "twee poten" oogden */
+    /* de klassieke, meteen herkenbare langnekdino: een heel lange gracieuze
+       hals, een groot rond lijf, een lange dunne staart en een klein koppie
+       met een grote vriendelijke oog - de verhoudingen die ieder kind al
+       kent, in plaats van een korte dikke nek op een gewone ovale romp */
     coloringGroup("dinosaur",
-      coloringFlat("dino-tail","M 232 452 C 160 434 90 438 40 462 C 62 490 112 502 168 498 C 202 494 224 476 236 460 Z","#3fae6a")+
-      coloringFlat("dino-hind-leg-far","M 388 470 L 424 470 L 420 526 L 430 566 L 396 570 L 386 526 Z","#3fae6a")+
-      coloringFlat("dino-fore-leg-far","M 266 472 L 300 472 L 298 522 L 306 566 L 274 570 L 264 522 Z","#3fae6a")+
-      coloringContour("dino-body","M 220 460 C 224 396 278 356 350 356 C 426 356 480 396 484 452 C 488 500 434 528 352 528 C 276 528 216 504 220 460 Z","#3fae6a")+
-      /* een echte S-bocht in plaats van een rechte buis, en kop+snuit als één
-         doorlopende ovale vorm in plaats van een los aangeplakt snuitje */
-      coloringContour("dino-neck","M 452 420 C 460 372 486 330 522 296 C 540 280 552 270 566 262 L 594 292 C 578 302 560 318 540 340 C 508 372 486 402 478 434 C 468 440 452 434 452 420 Z","#3fae6a")+
-      coloringFlat("dino-hind-leg-near","M 350 480 L 390 480 L 388 534 L 398 574 L 358 578 L 346 534 Z","#3fae6a")+
-      coloringFlat("dino-fore-leg-near","M 244 482 L 282 482 L 280 530 L 288 574 L 250 578 L 240 530 Z","#3fae6a")+
-      coloringContour("dino-head","M 572 278 C 558 252 570 222 600 212 C 630 202 658 218 664 246 C 670 272 654 296 624 302 C 598 306 580 298 572 278 Z","#3fae6a")+
+      coloringFlat("dino-tail","M 210 452 C 132 434 60 440 16 460 C 46 484 98 498 156 494 C 188 490 206 470 214 452 Z","#3fae6a")+
+      coloringFlat("dino-hind-leg-far","M 365 468 L 402 468 L 398 524 L 408 566 L 372 570 L 362 524 Z","#3fae6a")+
+      coloringFlat("dino-fore-leg-far","M 222 470 L 258 470 L 256 520 L 264 566 L 230 570 L 220 520 Z","#3fae6a")+
+      coloringContour("dino-body","M 155 460 C 155 394 220 348 300 348 C 384 348 445 394 445 452 C 445 506 380 536 300 536 C 224 536 155 510 155 460 Z","#3fae6a")+
+      /* een lange, hoge S-bocht in plaats van een korte diagonale buis */
+      coloringContour("dino-neck","M 425 405 C 460 350 505 300 555 265 C 575 248 590 230 600 210 L 636 232 C 622 254 604 274 582 300 C 538 342 500 380 480 420 C 458 428 432 422 425 405 Z","#3fae6a")+
+      coloringFlat("dino-hind-leg-near","M 322 480 L 364 480 L 362 534 L 372 574 L 330 578 L 318 534 Z","#3fae6a")+
+      coloringFlat("dino-fore-leg-near","M 198 482 L 238 482 L 236 530 L 244 574 L 204 578 L 196 530 Z","#3fae6a")+
+      coloringContour("dino-head","M 578 220 C 562 188 580 154 616 144 C 652 134 684 154 690 188 C 696 218 676 246 642 252 C 610 258 588 246 578 220 Z","#3fae6a")+
       coloringGroup("dino-detail",
-        coloringFlat("dino-belly","M 240 480 C 268 508 312 522 356 522 C 400 522 440 508 466 484 C 456 512 408 528 352 528 C 296 528 250 510 240 480 Z","#f7c948")+
-        coloringFlat("dino-back-plate-a","M 296 368 C 304 342 322 328 342 332 C 328 348 316 360 310 374 Z","#f28c3c")+
-        coloringFlat("dino-back-plate-b","M 350 358 C 358 330 376 316 396 320 C 382 336 372 348 366 362 Z","#f28c3c")+
-        coloringFlat("dino-back-plate-c","M 404 362 C 412 334 428 322 446 328 C 432 342 424 354 418 368 Z","#f28c3c")+
-        coloringCircle("dino-eye",632,244,11,"#ffffff")+
-        coloringDot(633,245,5)+
-        coloringFlat("dino-nostril","M 570 264 C 563 260 556 262 553 268 C 558 274 566 274 570 269 Z","#8b5a3c")+
-        coloringFlat("dino-foot-hind-far","M 380 560 L 436 560 L 434 574 L 384 578 Z","#8b5a3c")+
-        coloringFlat("dino-foot-fore-far","M 258 560 L 312 560 L 310 574 L 262 578 Z","#8b5a3c")+
-        coloringFlat("dino-foot-hind-near","M 340 568 L 404 568 L 402 584 L 344 588 Z","#8b5a3c")+
-        coloringFlat("dino-foot-fore-near","M 232 568 L 294 568 L 292 584 L 236 588 Z","#8b5a3c"),2)+
-      coloringLine("M 560 274 C 553 280 550 288 552 296")+
-      coloringLine("M 272 466 C 306 478 356 484 404 482 M 480 400 C 500 380 522 358 546 338 M 96 484 C 140 492 180 492 216 486 M 300 526 C 314 534 330 534 344 528",3))+
+        coloringFlat("dino-belly","M 200 480 C 228 508 268 522 308 522 C 350 522 388 508 415 484 C 405 512 360 528 305 528 C 250 528 208 510 200 480 Z","#f7c948")+
+        coloringFlat("dino-back-plate-a","M 250 366 C 258 338 278 322 300 328 C 284 346 270 358 264 372 Z","#f28c3c")+
+        coloringFlat("dino-back-plate-b","M 305 350 C 313 320 333 306 355 312 C 339 330 325 342 319 356 Z","#f28c3c")+
+        coloringFlat("dino-back-plate-c","M 360 356 C 368 326 386 314 408 320 C 392 338 380 350 374 364 Z","#f28c3c")+
+        coloringCircle("dino-eye",655,180,15,"#ffffff")+
+        coloringDot(657,181,7)+
+        coloringFlat("dino-nostril","M 588 208 C 580 204 572 206 568 212 C 574 218 583 218 588 213 Z","#8b5a3c")+
+        coloringFlat("dino-foot-hind-far","M 356 560 L 414 560 L 412 574 L 360 578 Z","#8b5a3c")+
+        coloringFlat("dino-foot-fore-far","M 214 560 L 268 560 L 266 574 L 218 578 Z","#8b5a3c")+
+        coloringFlat("dino-foot-hind-near","M 312 568 L 378 568 L 376 584 L 316 588 Z","#8b5a3c")+
+        coloringFlat("dino-foot-fore-near","M 188 568 L 250 568 L 248 584 L 192 588 Z","#8b5a3c"),2)+
+      coloringLine("M 576 216 C 568 222 564 230 566 238")+
+      coloringLine("M 240 466 C 274 478 324 484 372 482 M 460 380 C 486 356 514 332 542 310 M 60 480 C 100 490 140 490 178 484 M 280 526 C 294 534 310 534 324 528",3))+
     coloringGroup("eggs",
       coloringFlat("egg-a","M 168 566 C 156 546 162 522 180 516 C 198 522 204 546 192 566 Z","#f7c948")+
       coloringFlat("egg-b","M 214 570 C 202 552 208 530 224 524 C 240 530 246 552 234 570 Z","#f7c948")+