They are such a wonderful building toy because the child really has to think and plan and predict. They have to make sure everything balances and has support, they have to make sure it is angled so the marbles don’t get stuck. And then there’s all the fine motor work. Marble runs are a perfect STEM toy but even most important, they’re really fun. And then after all the building they can use it.
This is the run Pumpkin 1 built today all on her own.