Ivi Playhouse 3D Montessori Play Mat, Non-Toxic, Stain Resistant, Educational Activity Toys For GirlsIVI three dimensional carpets are designed to stimulate and encourage childrens play in a creative, entertaining and interactive way with room for friends to join in. No batteries required. These unique carpets are designed by a Turkish architect and mother of two and were developed to promote independent thinking and a traditional process of play through discovery. IVI is committed to producing the healthiest carpets on the market for your child.