To make the backs visible the "constellation" has a digital twin which can be accessed by scanning a QR code that is installed next to it.
The current "web side" is not so great but I am thinking about making it better with a WebGL-based back end.
I like the game Paper Mario Sticker Star where you can peel things with the touch screen on the Nintendo 3DS. It would be natural in my interface for people to be able to peel an image off the wall on their phone to see the back side. Is there a good library for recognizing the kind of touch gesture in Javascript?