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Oh my this was fun! My nearly 11 year old boy makes stuff like this ALL the time. Loo roll middles, pencils, sticky tape, bits of anything you can imagine mashed with 'proper' boy and girl building toy stuff.
As for what this does ~ it's a wind powered atomic heat bubbly exploding wheeeeeeee rolling ball clunk click whatsitsname do da thingy.
It is what it is.
With added volcano.