orologio en CB01 OFFICIAL. In 'Expansion in Space' (1977, Dokumenta 6, Kassel), Ulay and Abramovic do not collide with each other, as they did in Relation in Space (1976), but with two free-standing pillars twice their individual body weight. Their goal is to make the pillars move by means of their naked bodies, and in this way to expand the space of action