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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

Cardboard Automata are a playful way to explore simple machine elements while creating a mechanical sculpture.

Create an instrument that you don't play--you just listen to it through tubes of various lengths.

In this design challenge activity, learners build a machine out of cardboard that runs smoothly and dependably. Learners must be precise to make sure their component works properly.