Solar Disco at Zadar in Croatia
From Lonely Planet website:
Another wacky and wonderful creation by Nikola Bašić, this 22m-wide circle set into the pavement is filled with 300 multilayered glass plates that collect the sun’s energy during the day. Together with the wave energy that makes the Sea Organ ’s sound, it produces a trippy light show from sunset to sunrise that’s meant to simulate the solar system. It also collects enough energy to power the entire harbour-front lighting system.