BURY, Pol

Whereas most kinetic sculptures incorporate quick movements, this Belgian sculptor makes work that moves slowly, very slowly, so slowly that the movement can't be observed by the continuous eye, but measured if one turns away before returning. The Staircase (1965) has several circular, slanted platforms on a vertical core over six feet high. On each of these platforms are several tiny balls that slowly, ever so slowly, roll down the inclines; but instead of falling off, they roll back up...