float angle = 0.0;
float stepSize = 0.05;

int halfHeight, thirdHeight, sixthHeight, interval, startX, endX;

float proportion = 0.0;
float anoise = 0.0;

void setup() {
  size(640,480);
  lights();
  noStroke();
  halfHeight = height/2;
  thirdHeight = height/3;
  sixthHeight = height/6;
  interval = width/100;
  startX = 0;
  endX = width;
}

void loop() {
  //background(180,180,190);
  background(100);
  for (int i = startX; i < endX; i+=interval) {
    proportion = float(i)/width;
    anoise = 2*sin(proportion*PI);
    push();
    translate(i,halfHeight);
    rotateX(angle*proportion);
    rotateY(angle-proportion);
    rotateZ(angle*proportion);
    translate(0,-anoise*sixthHeight);
    fill(255,255,200);
    box(3,3,3);
    translate(0,anoise*thirdHeight);
    fill(255,255,235);
    box(3,3,3);
    translate(0,-anoise*sixthHeight);
    translate(0,0,-anoise*sixthHeight);
    fill(255,245,230);
    box(3,3,3);
    translate(0,0,anoise*thirdHeight);
    fill(245,225,200);
    box(3,3,3);
    pop();
  }
  if (!mousePressed) {
    angle+=stepSize*(mouseX-(width*0.5))/(width*0.5);
  }
  if (angle >= width*TWO_PI) {
    angle = 0.0;
  }
}

void mouseClicked() {
  stepSize*=-1.0;
}