With this large-scale modular construction kit, parents and children can work together to design and build play structures on which children can actually climb, crawl, slide and play. Larger, more interesting and more complex designs can be created by adding more components or accessories such as slides or wheels. It’s designed to be easy to take apart so users can build something new and different as often as desired. This Basic kit includes wheels to make rolling vehicles. Launch date: 1979.