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The Exploratorium had this... box of Christmas tree balls on a stand. No other explanatory note. We never did figure out what we were supposed to learn from them. There are little slots that you can lift with your fingers and see... more Christmas tree balls.
A giant table of pins that would take the shape of the objects under them, like my hand for example. I used to play with one of the small ones at my old dentist's office. This one took me back.
Came by to hang out with us. The exhibits were left running for a couple of hours after closing time, so we had the place to ourselves.