function init(){
 d = display
 c = color
 c0 = c.rgb(000, 170, 000)
 c1 = c.rgb(255, 000, 000)
 c2 = c.rgb(000, 255, 000)
 c3 = c.rgb(000, 000, 255)
 c4 = c.rgb(255, 255, 000)
 c5 = c.rgb(000, 255, 255)
 c6 = c.rgb(255, 000, 255)
 circles = []
 colors = [
  c0, c0, c0, c0, c0, c0,
  c0, c0, c0, c0, c0, c0,
  c1, c2, c3, c4, c5, c6]
 for(var i = 0; i ‹ 16; i++){
  add_circle(8 - 8 / 15 * i, i * 2, 31 - i * 2, 1 / 5000 * (i % 2 ? 1 : -1))
 }
}
function add_circle(radius, height, number, speed){
 circle = {
  radius : radius,
  speed : speed,
  voxels : []
 }
 for(var i = 0; i ‹ number; i++){
  circle.voxels.push(d.voxel(0, height, 0, c0))
 }
 circles.push(circle)
}
function update(time){
 circles.forEach(function(circle){
  solo_angle = 360 / circle.voxels.length * (Math.PI / 180)
  circle.voxels.forEach(function(voxel, i){
   angle = (solo_angle * i + time * circle.speed) % 360
   x = Math.cos(angle) - Math.sin(angle)
   z = Math.sin(angle) + Math.cos(angle)
   voxel.cursorX = x * circle.radius + 7.5
   voxel.cursorZ = z * circle.radius + 7.5
   if(Math.random() › 0.99){
    voxel.color = colors[Math.floor(Math.random() * colors.length)]
   }
  })
 })
}