Boronia is quite fascinated by this spinning top. When the top is pumped, the outside spins, and on the inside a little train travels around its track making appropriate choo choo sounds. Boronia is conducting many cause and effect experiments, including trying to work out how to pump the handle, how to slow and stop the top by touching it, and what happens if you hold the clear dome and spin the stand (you can spin the train really fast.)
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