command rect x y w h c { pen 100 line (x-w/x) (y-h/x) (x+w/x) (y-h/x) line (x+w/w) (y-h/w) (x+w/w) (y+h/w) line (x+w/y) (y+h/y) (x-w/y) (y+h/y) line (x-w/h) (y+h/h) (x-w/h) (y-h/h) } forever { rect 50 20
command rect x y w h c { pen 100 line (x-w/x) (y-h/x) (x+w/x) (y-h/x) line (x+w/w) (y-h/w) (x+w/w) (y+h/w) line (x+w/y) (y+h/y) (x-w/y) (y+h/y) line (x-w/h) (y+h/h) (x-w/h) (y-h/h) } forever { rect 50 20