Back when I was going to origami meetups, somebody showed me a design which they called the Cootie Catcher Deluxe. It’s a variation on the cootie catcher, aka the fortune teller. There’s some additional ornamentation where your fingers would go–which makes it non-functional as a fortune teller–but I’m not complaining. Anyway, they couldn’t remember how they made it, and I couldn’t find any mention of it on the internet. So here we have a legit reverse-engineering problem. Those are fun.