A wonderful visual and tactile experience that really will encourage you to move around and explore the surfaces. Ideal for use in sensory rooms or environments, the bright colours and ever changing shapes encourage visual stimulation as well as movement and touch. Each tile is filled with a liquid gel so that each step or movement will cause the liquid gel to shift in an array of patterns. set them under ad UV lamp or torch and watch them glow brightly. Set of 4 assorted colours.