let factor;

function setup() {

  createCanvas(600,600);

  size=4;

  factor=0.01;

  noStroke();

}

​

function draw(){

  background(220);

  for (i=0; i<=width; i+=size){

    for (j=0; j<=height; j+=size){

      fill(random()*255, random()*255, random()*255)

      circle(i,j,size)

    }

  }

  //perlin noise

  // for (i=0; i<=width; i+=size){

  //   for (j=0; j<=height; j+=size){

  //     fill(noise((i+50)*factor,(j+50)*factor)*255,

  //          noise((i+100)*factor, (j+100)*factor)*255,

  //          noise(i*factor, j*factor)*255)

  //     square(i,j,size)

  //   }

  // }

  noLoop();

}