Climbing gym becomes transparent at night

In the small town of Brixen in Northern Italy, there is a climbing gym that is like no other. The exterior looks like a piece of crumpled tin foil, and what's more, when night falls the crumpled building becomes transparent, with the climbers inside on view for all to see.

http://mashable.com/2013/02/08/climbing-gym-transparent-night/

Hube