Obscure Results and Areas of Mathematics

Question

My degree is in economics although I did relevant mathematics in college and used algebraic topology in my thesis. Over the Pandemic I've been reading a lot of mathematics that I didn't get a chance to in college. I now have very few major topics to cover on my list, and am starting to think of what to look at next in mathematics. I don't want to pick a subject like homological algebra because I have a little bit of abstraction vertigo right now. That's not to say I need easy proofs, the hardest I've gone through is a grad book on Riemann Surfaces to get my way to The Uniformization Theorem, to give an idea of where I'm at. So I'm looking for results or ideally mini-areas of mathematics to study which are pretty, accessible (at least in terms of statements of theorems, if not proofs) and off-the-beaten-path. Some great examples for me would be the theory of Sturmian words or the mathematics of origami.