Cool, that's a nice strategy. And in that case you don't even need to make the problem simple at all! What I also always try to do is give context: "You're now

Cool, that's a nice strategy. And in that case you don't even need to make the problem simple at all! What I also always try to do is give context: "You're now writing a seemingly ad-hoc double for-loop in which you assign some function to each pixel. What you should look up is a Hilbert space." I don't know how to test for that though. :-D