I've posted the illustration here previously, and now I can post the puzzle. And now you can go get it!
Galison/Mudpuppy commissioned this last year and released it this month. One side is colored by me and the other side is to be colored by you or your kids or friends.
This particular illustration was also just accepted into the 3×3 magazine children's illustration annual, along with my #6 race car collage.
Wow! I'm off to get one – the guys at NASA will have a fit! :)