Forget building sets that let your kid build a house he can play with. Bilderhoos lets your kid build a house he can play in! The pieces are made of 1″ thick marine-grade 9-ply plywood that has been triple-coated with exterior water-based polyurethane. The edges of each board are rounded with a router and sanded to a smooth, soft finish, so they are safe for children. The 50 piece set is reconfigurable without tools into many different structures, such as a fort, playhouse, or a tower sturdy enough to climb on. The Bilderhoos Hoos Architectural Play Set is designed for children age 4 and up. It’s $849.95 from The Grommet.