sentences:  There is limited space within the niches for sculpture.Almost immediately, in 1962, Messer took a risk putting on a large exhibition that combined the Guggenheim's paintings with sculptures on loan from the Hirshhorn collection.Three-dimensional sculpture, in particular, raised "the problem of installing such a show in a museum bearing so close a resemblance to the circular geography of hell", where any vertical object appears tilted in a "drunken lurch" because the slope of the floor and the curvature of the walls could combine to produce vexing optical illusions.