Space Through Light and Shadow Plane

background(255);
size(500, 500);
translate(width/2, height/2);
int w = 100;
int h = 100;
rectMode(CENTER);
rect(0,0,w,h);
fill(0);
triangle(w/2,h/2, w/2, h/4, (w/4) * 3,h/4);
saveFrame("out.png");