A Constructive Playthings Exclusive and customer favorite, these Photo Stacking Blocks are always a hit! Familiar faces add a personal touch to first time stacking with these 4 cloth-covered, 4¼" square soft foam blocks. The clear vinyl pockets on each side allow you to insert photos to work with kids in all kinds of fun ways, from name recognition of family members, pictures of objects to discuss differences and similarities (shapes, colors, vegetables, fruit), identification of various community helpers, or even celebrating diversity within a classroom or small group. It takes traditional block play to a whole new level!