Saw these style boards on Oriental Trading for use as geometry boards. Wondered a diy hack. Use glue on bottom circle of thumbtack to secure it from being plucked out by little fingers. Sowdering About in Seattle: Toddler Busy Boxes
Colorful Tangrams: At the circus. (Set Most of the puzzles in this set are multicolored. These pattern cards / worksheets are more challenging as the 'inline' tangram puzzles but not as difficult as the well known black silhouettes.