Toys, Games and Hobby Products Design Poly Beat Rhythm Exercises Toy by Zhou Leijing Poly Beat is a rhythm exercise toy designed for children. Geometric polygons are used to make musical rhythm visible, helping children understand notes and rhythm patterns. The toy is made of injection-moulded plastic. Children insert note blocks into discs and place four discs into a column base. A camera at the top reads the colours of the blocks, and one button plays the matching rhythmic sound. A second button switches the sound to drums, marimba, piano or guitar. Free assembly of the blocks allows children to create their own rhythms.