I recently got a copy of Mi Wu’s new book “Duo Color Origami” and knew there were models I had to try:

Colour change is a tricky thing, designing to deliberately form patterns with the reverse side of the page is a real skill and Mi Wu seems to have mastered it, his book contains many unique and very challenging models.

I like this, it is a badge, rounded corners, like an icon shape and clever reveal of the white “?” – precise folding needed, genius design.