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This activity is very interactive and fun, but also can get rather messy. Make sure to do this activity either outside, or somewhere that is easy to clean up, such as wooden floors or tile instead of carpet as the flour and coffee grounds/cocoa powder/etc. may scatter out of the tin. Not all of the materials are very easily accessible, like the marbles, or you may not want to use them all up because of scarcity, like the flour. You might be able to substitute the marbles with other small objects of varying sizes and weights.