Lester Walker (Architect and Tiny House Designing Pioneer) coined the term "Turniture" (Furniture that transforms from one thing/use into another), decades back, and this little desk would certainly apply.
This one was designed/contributed by Dieter Amick
When flipped downward, the chair's back becomes a tiny desk, with a drawer for storage, and a chalk-board surface.
The book is 320 pages, full color, and has some very thorough plans- if plywood n' funky furniture is your thing, I'd give it a whirl.
Here's a link....