def zig(n) { if n - 1 { zig(n/2) zag(n/2) zig(n/2) zag(n/2) } else { turnleft 90 forward 15 turnleft 90 forward 15 } } def zag(n) { if n - 1 { zag(n/2) zag(n/2) zig(n/2) zag(n/2) } else { turnright 90 forward 15 turnright 90 forward 15 turnleft 90 forward 15 } } penup forward -250 turnright 90 forward 250 pendown zig(16) color red zig(16)