//

size(300,300);

background(255,0,0);

rect(0,0,50,50);
rect(50,50,50,50);
rect(0,50*2,50,50);
rect(50*2,0,50,50);
rect(50*2,50*2,50,50);

rect(150,0,150,150);
rect(175,25,100,100);
rect(200,50,50,50);

rect(0,150,150,150);
rect(25,150,25,150);
rect(75,150,25,150);
rect(125,150,25,150);

line(0,0,300,300);
line(0,300,300,0);
line(0,150,150,0);
line(150,0,300,150);
line(150,150,300,0);
line(0,150,150,300);
line(150,300,300,150);

line(0,75,300,75);
line(0,225,300,225);