just follow the line! click and drag to draw (or use the spacebar). carefully trace the line to draw a penrose triangle. press 'a' when you're done to hide the guide. then doodle all you want
https://en.wikipedia.org/wiki/Penrose_triangle this works in real life too, but you have to supply the symmetry yourself ;) @@@@@@@@@@ advertising will be deleted. spam your projects somewhere else (maybe Show and Tell?)
