Ruin marble (the shifting city)

You never know what you are going to get with the world in this stone. Each step along the hills takes you to subtly different worldscape. What's the backstory and what hapoens when you move between the worlds?

Ruin marble is a completely naturally occuring product. It comes from Florence, Italy and has been prized since the Renaissance.  It was a firm favourite of Lorenzo Di Medici; who liked art as much as politicscand intrigue.