Ideal for building your first outdoor tower or house: · Teaches shape and space through play · This 12 piece set contains 8 squares (in 2 designs) and 4 equilateral triangles in 4 colors · Build large outdoor constructions such as a castle, tower, or tunnel · Children will be able to build large constructions, whilst all the time learning about shape, 2 and 3 dimensional objects, texture, team-work, and role play. They will work together to put their ideas into reality. · The pieces easily slot together to create studry structures · Lightweight and safet to use · 4 times the size of Giant Polydron and also compatible with Giant Polydron · Use indoors or outdoors. Easy to pack away. · Squares measure 15.94" x 15.94"