Styled after a marble run kit I had when I was younger, I thought that it would be more creative and interesting for kids to play with if the kit itself was LEGO compatible.
Kids would be able to do more than just operate within the confines of the materials given to them, which would allow them to build more interesting and complex physical structures.
Below is the mainframe of a LEGO compatible toy car. That is, children would be able to stack and connect various LEGOs, wheels, and frames in order to observe what would roll down a ramp the fastest, or perhaps play with the weight of the car in order to observe varying speed.
Again, this would combine creativity with structural and spatial engineering thought.
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