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The Magna Doodle has a lattice filled with a thick liquid. The liquid contains magnetic particles of iron oxide. The particles can be pulled through the liquid in response to magnetic force applied by the pen. Gravity can not pull them through, which means they don't sink back into the liquid by themselves.

See also Wikipedia:Magna Doodle, How does a Magna Doodle Work? on HowStuffWorks, and How does Etch A Sketch work?

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