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It's not clear why they are throwing things. Are they expressing frustration? Do they enjoy the calamity?

Movement activities are best in this case: Mimicking, dancing, clapping. There is energy used up, which makes sitting down activities easier to cope with.

If you are looking for art activities, try paper and string. Folding, knotting, tearing and stickers. Some other art materials are also soft, like straw, pipe cleaners, cellophane and foam.