Giant slides installed in high-brow art-gallery, fun ensues...  
"It's a thrill that you can relate to sex or drugs. You can't control it, yet everybody smiles. It gives you a fear that is very pleasant.  
Carsten's idea is that if you did it every day we'd be happier. If Tony Blair took a slide on the way to Parliament it would have all sorts of beneficial effects."  
Looks worth a visit.