Geoboards teach all sorts of geometric concepts (such as shapes, polygons, angles, area, perimeter, and fractions), but I must confess why I really like them: they keep preschoolers happy for a long session! There is definitely something exciting about stretching colorful rubber bands and hooking them on the pegs to create shapes and designs. This geoboard has an 11” x 11” peg configuration, making it possible to create lots of intricate designs. I keep our geoboard in my bag that goes to church with us, as they are remarkable for keeping preschoolers occupied for the entire meeting! (Quiet = reverent, I hope).