Science and art combine when kids make designs on these temperature-sensitive floor mats. The mats are red at room temperature. By touching them with warm hands and feet, kids make white designs. Using the included water pen, they’ll make blue drawings. It’s fun and magical! Just spread the mats out on the floor and let ‘em have at it. Set includes 4 color-changing mats and 12 solid color mats that do not change color, for a total of 16 square feet. Ages 3 and up.