Sixteen square base pieces interlock to create 3-D or flat structures that you can even turn into a gear box

It's 1/5 lb

vintage style

and physicist Chien-Shiung Wu

1 scratch stick

Puzz & Stack Rainbow pink unicorn hopper Sixteen square base pieces interlockPuzz & Stack is an easy to assemble wooden puzzle and stacking game. The pieces stack onto the wooden peg to form a pretty flower pyramid with a little frog on top. The puzzle pieces form a pyramid. Wide pieces that are easy for little hands to grip. The pieces stand up by themselves for even more possibilities. Sold in a box: practical as a gift and for storage. Contents: Wooden shape sorting puzzle with 7 pieces on a base. Measurements: 1. 38 x 8.