Your little learner will delight in stacking and matching with the Geometric SYour little learner will delight in stacking and matching with the Geometric Stacker from Melissa & Doug. Kids enjoy playing with 25 colorful wooden pieces that they can match and stack on three rods. Shapes include rings, octagons and rectangles-- the combinations can be fascinating! This learning toy is great for building early shape, color and size differentiation skills!tacker from Melissa & Doug.