Inspired by Piet Mondrion...

size(800, 800);

background(255);

​

void moveShapes() {

  int cool = random(255);

  int cooler = 255-cool;

  background(cool);

  noStroke();

  fill(random(255), random(255), random(255));

  xPos1 = random(190, 210);

  yPos1 = random(590, 610);

  quad(xPos1, 0, 800, 0, 800, yPos1, xPos1, yPos1);

​

  fill(random(255), random(255), random(255));

  quad(0, yPos1, xPos1, yPos1, xPos1, 800, 0, 800);

​

  fill(random(255), random(255), random(255));

  xPos2 = random(690, 710);

  yPos2 = random(690, 710);

  quad(xPos2, yPos2, xPos2, 800, 800, 800, 800, yPos2);

  stroke(cooler);

  strokeWeight(10);

  line(0, yPos1, 800, yPos1);

  line(xPos1, 0, xPos1, 800);

  line(0, yPos1/2, xPos1, yPos1/2);

  line(xPos2, 800, xPos2, yPos1);

  line(xPos2, yPos2, 800, yPos2);

}

​

void draw(){

  moveShapes();

}