This is a, excuse the pun, brilliant use of micro wind turbines:

the installation is custom built, using 500 mini wind turbines to generate power, which illuminates hundreds of mounted leds, creating firefly-like fields of light, with wind visually interpreted as electronic patterns across the installation.

Go have a look at the video of the installation in action. This is great meshing of art and technology, I can’t wait to see what Jason Bruges comes up with next.
[via core77]
Wind to light