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
The goals you want to work are the development of logical and spatial skills through visual observation of a model and later playback. It is a material that promotes concentration and strengthens fine motor skills.