Runnel

Eight design-shop desk toys in ring-grained wood, veined marble and brass, standing in low window light whose panes fall across them and the page: a marble-run tower, a seesaw, a Newton's cradle, a spiral ramp, a spinning top, an abacus that counts, a vortex funnel and a stair the ball hops down. Each one keeps moving; tap for its trick. Six wood-and-stone palettes.