Crystal Colour Stacking Blocks

See, hear, touch and play with these fun, lightweight blocks specially designed with grooves for stacking up as high as you can build them. Then enjoy the crisp sounds they make as they topple over each other. Right side up, or upside down, the blocks are easily stack-able into simple or complex forms and are great for learning how different structures work together to support one another. Overlap different colours to explore colour-mixing concepts by placing over a light source. Includes: 50 blocks, (5 x 6 cm) and guide. Age: 3+.