Ball Run & Waterfall set lets children build water runs, ball runs, water falls and more in the bath. Sometimes the most educational toys are the simplest toys-- toys with lots of open-ended possibilities that encourage young minds to think, to create and to explore. The best of these toys provide progressive layers of challenge for children to discover as they grow. At their very best, these toys encourage exploration, reward discovery and empower our children. BathBlocks bring classic building block play into a fun, fascinating, new, watery environment. The bath tub is the perfect places to create water falls, ball runs, water runs and more. The "sticky" viscosity of water creates a helpful cling between blocks, and the movement, buoyancy and flow of water add an engaging twist to classic block play. BathBlocks empower children to create their vision and build STEM skills (Science, Technology, Engineering, Math) as they experiment with geometry, addition, subtraction, multiplication, division, balance, structure and cause-effect. BathBlocks have won Oppenheim Gold awards. BathBlocks are made from bacteria and mildew resistant EVA and contain no PVC or phthalates. WARNING: Age: 3+ years due to small ball.