The first couple of times this project came up on my screen, it was an easy pass. "Mona Lisa. Bah. Pass."
But, looking at it closer, I see there's a bit of cleverness going on in how the images are being made two-way, and that appeals to my sense of whimsy. I'm in for a couple. The art is interesting, and the company behind this deck have always delivered to me in a timely fashion, whether ordering from their site directly or via Kickstarter; quick and professional. Printed by USPCC. I can spring for a couple decks.
I may even go in on a puzzle; I have to think about that. Those could be really fun, what with the image being two-way, and all.