Transformation is the design concept of the PS11-TR07. A sofa can be transformed into a mattress. Also the product is transformed into four modules such as a desk or a tangram block and children can enjoy various tangrams. It is 1800mm wide, 1200mm long and 145mm high. Thanks to its width of 1800mm, even an adult can lie down on the sofa. Parents can read a book to children. It also helps children develop their creativity by playing tangram with their parents. The PU cover is used as an exterior, posing no health hazard to children. It is a non-toxic material, totally free of formaldehyde.