Ah, art.
The Hayward Gallery in London is putting an exhibit featuring 50 "invisible" works by famous artists, and charge real money for you to "see" them.
Invisible: Art about the Unseen 1957 - 2012 opens on June 12 and includes an empty plinth, a canvas of invisible ink and an unseen labyrinth. [...]
Ralph Rugoff, director of the Hayward Gallery, said: ''I think visitors will find that there is plenty to see and experience in this exhibition of invisible art. From the amusing to the philosophical, you will be able to explore an invisible labyrinth that only materialises as you move around it, see an artwork that has been created by the artist staring at it for 1000 hours, walk through an installation designed to evoke the afterlife, and be in the presence of Andy Warhol's celebrity aura.
''This exhibition highlights that art isn't about material objects, it's about setting our imaginations alight, and that's what the artists in this show do in many varied ways.''