It is that round white object on the bottom. (lbah.com)
Ear mites, which are barely visible to the naked eye, appear as small white objects. (lowchensaustralia.com)
Curator Nicholas Baume scattered LeWitt's 1974 «Variations of Incomplete Open Cubes» throughout the Wadsworth's venerable galleries and then invited viewers to wander the building, discovering the stark white objects in conversation with their surroundings. (artforum.com)