Mondrian

void setup() {
  size(500, 500);
}

void draw() {
  background(219,229,221);
  fill(186,45,15);
  rect(0,0,200,200);
  fill(255,190,26);
  rect(0,300,50,200);
  fill(2,31,91);
  rect(200,300,175,175);
  strokeWeight(9);
  line(200,0,200,500);
  line(0,200,500,200);
  line(0,300,500,300);
  line(50,300,50,500);
  line(200,475,375,475);
  line(375,300,375,500);
}