As students shuffled back and forth between classes in Birge Hall on the University of Wisconsin-Madison campus these past few weeks, they looked curiously at what Peter Krsko was up to. Up on a 14-foot-ladder, the Slovakian-born artist was building a plywood sculpture around one of the pillars in the entrance hall. Inspired by the plants he saw in the greenhouses at Birge Hall, Krsko constructed the sculpture of slender pieces of wood to climb 22 feet up the pillar like a vine, exploding outward like a geyser of water.