Double the black-and-white section with 50 more stickers

Animals (mouse, sheep, cow, elephant, monkey, lion, sloth, bat, spider,
hedgehog, shark, seal, caterpillar, pigeon, koala, squirrel), weather
(snowman, tornado, wind, icicle), food (toaster, banana, lemon, cherry,
pudding, teapot, hot dog, lollipop, carrot, milk), objects (scissors,
padlock, candle, fan, gears, stapler, faucet, trash, tv, cursor) and toys
and symbols (yo-yo, spring, Newton's cradle, drum, trumpet, bowling,
basketball, skull, question mark, puzzle).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

gen/bw/spring/boing.js

@@ -0,0 +1,28 @@
+// spring toy squashes down, boings up into the air stretched and wobbling, then lands and settles
+const{sin,cos,PI,max,min}=Math,T=2*PI
+export const frames=24,delay=60
+const N=4,R=40,E=11
+const D=(c,f,a=11,b=4)=>{for(const[l,s]of[[a,'#111'],[b,'#fff']])c.lineWidth=l,c.strokeStyle=s,c.beginPath(),f(),c.stroke();c.lineWidth=7;c.strokeStyle='#111'}
+export default(c,t)=>{
+  const sq=t<.3,air=!sq&&t<.8,a=(t-.3)/.5
+  const L=sq?100-50*(t/.3)**2:air?100+30*(1-a)*cos(3*PI*a):100-16*sin(PI*(t-.8)/.2),J=air?44*4*a*(1-a):0
+  const yb=212-J,yt=yb-L,hy=yt-28,k=1-J/110
+  D(c,()=>{c.moveTo(128-46*k,232);c.lineTo(128+46*k,232)})
+  c.beginPath();c.ellipse(128,yb+8,50,13,0,0,PI);c.lineTo(78,yb);c.ellipse(128,yb,50,13,0,PI,0,true);c.closePath();c.fill();c.stroke()
+  c.beginPath();c.ellipse(128,yb,50,13,0,0,T);c.fill();c.stroke()
+  // the coil: back half-turns first, then the front ones over them
+  const P=th=>[128+R*sin(th),yb-L*th/(N*T)+E*cos(th)]
+  for(const f of[1,0])for(let k=f;k<=2*N;k+=2){
+    const a0=max(0,(k-.5)*PI),a1=min(N*T,(k+.5)*PI)
+    D(c,()=>{for(let j=0;j<=12;j++){const[x,y]=P(a0+(a1-a0)*j/12);c.lineTo(x,y)}},14,5)
+  }
+  c.beginPath();c.ellipse(128,yt+4,30,9,0,0,T);c.fill();c.stroke()
+  c.beginPath();c.arc(128,hy,30,0,T);c.fill();c.stroke()
+  if(air&&a<.5)for(const d of[-1,1])D(c,()=>{for(let j=0;j<=6;j++)c.lineTo(128+d*(48+(j%2)*10),hy-24+j*8)})
+  c.fillStyle='#111';c.lineWidth=5
+  if(sq&&t>.08)for(const d of[-1,1])c.beginPath(),c.moveTo(128+d*18,hy-10),c.lineTo(128+d*8,hy-4),c.lineTo(128+d*18,hy+2),c.stroke()
+  else{for(const d of[-1,1])c.beginPath(),c.ellipse(128+d*12,hy-4,5,7,0,0,T),c.fill();c.fillStyle='#fff';for(const d of[-1,1])c.beginPath(),c.arc(128+d*12-2,hy-7,2,0,T),c.fill()}
+  c.lineWidth=4;c.beginPath()
+  if(air)c.ellipse(128,hy+12,5,6,0,0,T);else c.arc(128,hy+8,7,.15*PI,.85*PI)
+  c.stroke()
+}