BODYSPACEMOTIONTHINGS, 2011 (left)

It was a sensation in the 70s when the Tate was forced to close a new exhibit, just four days after it was opened, when it was almost wrecked by an overly exuberant public. Nearly 40 years on, Robert Morris’s Bodyspacemotionthings has lost none of its potential for danger after clocking up a string of casualties during a special reappearance at Tate Modern in the summer of 2012. The artwork, in which participants are invited to negotiate seesaws, a tightrope and other obstacles, left 23 people needing first aid in just over week.

Novembergruppe, 2011 (center)

In a letter from 1919, artists, sculptors and architects "of the new spirit" are called to join the revolutionary November Group. The letter is followed by the group's rules and charter.

Rules for an Understanding of Conceptual Art, 2009 (detail; right)

Photo © Bob Goedewaagen