The sensory Perception Spheres come in eight different clear colours and are smooth and pleasing to hold. The very youngest children will enjoy handling them in free sensory play or a part of a Treasure Basket collection.Older children will find them fascinating as they hold them up and look through them seeing the world around them in different colours. The way light behaves when children look through the spheres they will also see the world from a different angle. Holding two or three spheres together creates new colours and hues; using them on a light panel will enhance the children's opportunities for colour mixing.Includes information sheet in 4 languages and supplied in a foam-lined box for convenient storage.Size: 50 mm diameter.