nested Squares

let size = 70;

​

function setup(){

  createCanvas(windowWidth,windowHeight);

  background(0);

  stroke(255);

  noFill();

  rectMode(CENTER);

  frameRate(3);

  smooth();

}

​

function draw(){

  translate(size/2,size/2);

  for(var j=0;j<height;j+=80){

    for(var i= 0; i<width;i+=80){

      stroke(random(i),random(j),random(255));

      sqre(i,j,random(size));

    }

  }

}

​

function sqre(x, y, size){

  for(var d= size;d>0;d-=10){

    rect(x,y,d,d);

  }

}

​