/*Source*/ import Lsystem; size(8cm,0); Lsystem Koch=Lsystem("+F+F+F+F+F", new string[][]{{"F","F-F++F-F"}}, La=72); Koch.iterate(4); filldraw(Koch.paths()[0]&cycle, paleyellow, 1bp+black); shipout(bbox(2mm, Fill(lightyellow)));