Bath Blocks bring classic, educational block play into a fun, new watery environment The bath tub is the perfect place to create floating towns, bridges, towers and more The "sticky" viscosity of water (plus soap suds or shampoo suds) creates a cling between blocks and smooth, polished wall surfaces The movement, buoyancy and flow of water add an engaging twist to classic block play Bath Blocks empower children to create their vision as they experiment with geometry, addition, subtraction, multiplication, division, balance, structure and cause-effect Non-absorbent foam reduces grime build-up, cleans easily with mild soap, and dries quickly. Building Blocks based on 35mm x 35mm x 35mm (1.25"x1.25"x1.25") unit block. In Science Museums and Childrens Museums nationwide. Age: 3+ years.