The simple stacking fun of KEVA takes on a new dimension with special connectors that lock the planks in place. Slide precision-milled KEVA planks into the Connect pieces to create geometric compositions or freeform structures. As kids engineer their build-outs, they get a real life lesson on the design principles of scale and proportion and the physics of balanced forces. Builder Set includes 90 planks and 54 Connects. Includes a building idea booklet.