[ flat doesn't push when he sees varian frown, as he's not really sure how comfortable the younger teenager might be with a random stranger asking him to open up. it really isn't any of his business, as curious as he might be.

nonetheless, it is interesting. flat feels like he's being watched and while he's not feeling uncomfortable about it, it is a curious thing. it's not every day when someone trying to observe him back.

flat hums, thinking what he would do about it... and then snaps his fingers when the lightbulb in his brain turns on. ]

I'd probably make the shapes like a pattern! I guess you gotta think something between like tetris, puzzles, and patterns. Well, I guess they're all kinda related right? Actually, tetris might not even be good. But you just gotta make sure that the shapes tessellate in a 3d space. It might be hard, but I'm sure you could find a way to do it!

[ easier said than done is what most people would say. actually, most people would probably not even think that a full-fledged mathematician could do that, let alone a 14 year old. but flat will happily give the 14 year old the seemingly insane task... because he doesn't see why he shouldn't. ]