Many of the people from the general public who encounter us spinning tops at our juggling club are completely unaware that such things exist. They routinely ask us what the tops are, and show no signs they've ever seen one before.
I see the same phenomenon when I display my tops at LEGO shows. But I find it quite age-dependent.
Visitors in the over-60 set know all about tops, are delighted to come across my finger tops, and have no trouble twirling the ones I put out for the public to try. For them, it's like coming across long-lost friends. But on average, knowledge of and ability to twirl tops seem to decay rapidly as age decreases from there.
Many kids under 10 have no idea what a top is but are delighted to discover them. The parents, meanwhile, often have their noses buried in their cell phones and couldn't care less.
Same goes for the other LEGO spintoys I put on display.