These keep a 5 year old builder happy. The shapes, magnets, and simplicity of design encourage imagination and free play. While they won’t replace legos, they seem to stimulate a whole different type of creativity...instead of trying to duplicate intricate designs in solitary play, we see a lot more story-telling, collaboration, and “big idea” play...castles, spaceships, towers, pyramids...and incorporating other toys and objects. These were a favorite toy at Head Start, and we were happy to find a large set at a good price to have at home. In addition to free play, we get to work on sorting, shapes, and colors, and also talk about magnetism, polarity, and simple physics and geometry.