My preschool itty bitties recently visited the sculpture garden outside the National Gallery (a perk of living near DC!), and so we reviewed what they saw on their trip. We've talked about sculpture before and they learned the sculpture song. So these little ones can tell you exactly what a sculpture is.
They made cardboard sculptures out of egg cartons, paper rolls, odd cardboard packing materials, and scrap cardboard. The next week they painted the sculptures.