1. A system comprising: at least one peg defining a receptacle; at least one shaft sized so that an end of the at least one shaft may be inserted into the receptacle; at least one cube defining a sleeve sized to allow the at least one shaft to be inserted through the sleeve; at least one divider defining an open slot, the slot sized to allow the at least one shaft to fit into the slot; at least one tray defining a peg receptacle, the peg receptacle sized to allow insertion of at least one peg into the peg receptacle.