These beautifully polished translucent acrylic blocks in different shapes are designed to enable children to explore light & colour build patterns and sequences as well as create imaginative pictures. There are two sets to choose from Clear or Coloured Clear Crystal Block Set Includes: 25 polished crystal-clear acrylic blocks with smooth tactile surfaces. Set contains 17 different shapes.The regular shapes can help develop mathematical language and the understanding of geometric forms whilst the irregular shapes will allow for more creative and complex pictures whilst encouraging the use of descriptive language. Early science concepts can also be explored such as observing the fascinating way light behaves when passing through the shapes demonstrating refraction shadows internal reflection and distortionSize of largest block: 80mm. Colour Crystal Block Set Includes:Set includes 25 blocks 15 A4 work cards 1 acrylic plane mirror and a teachers' guide in 8 languages stored in a robust card box with key guide and foam inserts to protect the blocks.Regular shapes and forms (square triangle oblong circle ellipse)- Irregular shapes to enable more complex pictures to be made and to encourage a rich diversity of language such as wave zigzag arch bridge etc. The plane mirror for children to build patterns and see the effects of reflective symmetry. A mixture of coloured and clear blocks so children can see the world in a different hue overlay them to mix new colour combinations and use them on a light panel- 15 pupil work cards from simple ideas to more complex challenges. There are pictures to copy in 2D or 3D shape sequences to solve and ideas for reflective symmetry work and a teacher’s guide including background information suggested activities to try questions to ask the children and extension ideas. Size of mirror: 160 x 320mm. Largest block height: 80mm.Age suitability for Clear and Coloured 3 years +