//simple program to draw multiple rectangles
//set up the drawing
size(400, 400);
background(0);

//declare a loop variable
int i;
i=0;

//loops to draw the stairs, and rows of the sketch
while(i < 400) {
  fill(random(0, 255), random(0, 255), random(0, 255));
  rect(i, i, 20, 10);
  i = i+10;
}

i = 0;
while(i < 400) {
  fill(random(0, 255), random(0, 255), random(0, 255));
  rect(400-i, i, 20, 10);
  i = i+10;
}

i = 0;
while(i < 400) {
  fill(random(0, 255), random(0, 255), random(0, 255));
  rect(200, i, 20, 10);
  i = i+10;
}

i = 0;
while(i < 400) {
  fill(random(0, 255), random(0, 255), random(0, 255));
  rect(i, 200, 20, 10);
  i = i+20;
}

saveFrame("stairs.jpg");