The basic idea is that the heat of a user's urine creates pretty colors on the urinal.
Although this image is being posted on many different sites, I'm struggling to find any firm information about it. Perhaps it's better that way. I'm just going to tell myself that it's a really good photoshop, and no one actually built it.
Link via Gizmodo | Photo: Matrix Agent
The urinal itself is most probably the underground one in Uffizi museums, Florence.