JS1k: The JavaScript code golfing competition

c.width=c.height=500;
v=[[-99,-99,99],[99,-99,99],[99,99,99],[-99,99,99],[-99,-99,-99],[99,-99,-99],[99,99,-99],[-99,99,-99],[-99,-99,99],[99,-99,99],[99,-99,-99],[-99,-99,-99],[-99,99,99],[99,99,99],[99,99,-99],[-99,99,-99]];
M=Math;R=M.PI/180;t=0;a.strokeStyle="#fff";a.fillStyle="rgba(0,0,0,.5)";SD=1;S=0.1;
setInterval(function(){k=M.cos(t);s=M.sin(t);u=M.cos(t*3);w=M.sin(t*3);V=[];a.fillRect(0,0,500,500);a.beginPath();
for(I=0;I<16;I++)V[I]=[u*k*(v[I][0]*S)+(u*s*s-w*k)*(v[I][1]*S)+(u*s*k-w*-s)*(v[I][2]*S)+250,w*k*(v[I][0]*S)+(w*s*s+u*k)*(v[I][1]*S)+(w*s*k+u*-s)*(v[I][2]*S)+250]
for(I=0;I<16;I+=4)a.moveTo(V[I][0],V[I][1]),a.lineTo(V[I+1][0],V[I+1][1]),a.lineTo(V[I+2][0],V[I+2][1]),a.lineTo(V[I+3][0],V[I+3][1]),a.lineTo(V[I][0],V[I][1]);
a.stroke();a.closePath();t+=R;S+=SD?.01:-.02;S>=1.5?SD=0:S<=.0?SD=1:0},20);

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