A beautiful shape, color, design and sorting work is this three layered box of cut out shapes. It can be as easy or as advanced in structure as you wish. I bought mine here: http://www.ebay.com/itm/MONTESSORI-CIRCLES-SQUARES-and-TRIANGLES-NEW-/120584620267?pt=LH_DefaultDomain_2&hash=item1c136748eb#ht_528wt_1051