London's Hayward Gallery is mounting an exhibition of Invisible Art. The exhibition includes pieces such as Andy Warhol's Invisible Sculpture, essentially an empty pedestal, and, seen above, Tom Friedman's "1000 Hours of Staring," a large blank sheet of paper that he looked at repeatedly over five years. They should play John Cage's 4'33" as the exhibit soundtrack. From The Telegraph:
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 materializes 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."
"Empty plinth and blank piece of paper to feature in exhibition of invisible art" (The Telegraph)
Invisible (Hayward Gallery)