These windows help children explore colour mixing and construction in a fun and engaging way.The My First Polydron Windows Set 72 Piece set looks spectacular against a light source.This My First Polydron Windows Set 72 Piece set is ideal for a small group of children to build their first constructions as they explore light and colour. Easy to join together. Ideal for younger builders. Supplied in 5 colours. Large, brightly coloured pieces. Create stunning 2D and 3D models.Helps with the first steps of understanding shape and space. High quality and durable. Includes: 30 Window Squares, 6 Frame Squares, 30 Window Triangles & 6 Frame Equilateral Triangles