seattleweekly.com — Naj Tunich is the name of a winding, many-limbed underground Mayan cave in Guatemala, rediscovered in 1980 and visited by artist Leo Saul Berk six years ago. Now Berk takes over the Hedreen Gallery with three meditations on this ancient subterranean world. Suspended just above the floor in the center of the gallery is a sculpture in yellow foam de