We popped into Metalli Zug this afternoon, and were pleasantly surprised to see a great exhibition that is on in the main court. It is a series of optical illusions that one stares at and then things get all wonky. The real cool ones must be the two illusions that have created on the floor that you get to actual be a part of for a great photo opp.
Illusion Space Exhibit
Zug Metalli Shopping Centre