Optical Illusion Generator

int[] circles;

int lastDiameter;

boolean firstTime;

int spacing;

​

void setup(){

  size(600,600);

  spacing = 20;

  circles = new int[90];

  int foo = 0;

  while(foo <= circles.length - 1){

    circles[foo] = width + (foo * spacing);

    foo++;

  }

}

​

void draw(){

  background(200);

  stroke(3);

  strokeWeight(4);

  noFill(5);

  int arrayItemOn = 0;

  while(arrayItemOn <= circles.length - 3){

    int diameter = circles[arrayItemOn];

    if(diameter <= 0){

      circles[arrayItemOn] = lastDiameter + spacing;

      diameter = lastDiameter + spacing;

    }

    else{

      circles[arrayItemOn] -= 3;

    }

    ellipse(width/2,height/2,diameter,diameter);

    if(arrayItemOn == circles.length - 1){

      firstTime = false;

    }

    lastDiameter = diameter;

    arrayItemOn++;

  }

}