I was going to try and explain this, but the video does it much better.

San Francisco’s Temple, Rotterdam’s Watt and London’s  Surya are all eco-nightclubs that already feature piezoelectric dance floors that supposedly generate around half of the buildings electricity. There are some who are sceptical about these claims, however most believe it is a technology with real possibilities that will become a valuable weapon in sustainable designs arsenal.

Additional uses for Piezo:

Yusuke Obuchi’s phenomenal Wave Garden

Self-sufficient Train Station ticket gates

For more detailed information click here