The one and only Crystal Cave is an incredible 96-page collection which contains every single one of the world famous Altair Design patterns and brings together new designs by Roger Burrows, Prof Roger Penrose, Haifa Khawaja and John Martineau. What do you see? Colour it in! Enhance your creativity and visual imagination! Learn to conjure epic pictures out of an empty page and develop this useful skill with Altair Design pattern pads. Choose a design. Relax. Look without staring. Slowly, faces, animals, entire scenes, and abstract patterns will appear.