That was Aeva’s favorite thing at our museum too, lol. We even got her a ball toy because of it, and she loves it.
My Boss already has more than enough balls. She inherited them from me.
On a related note, I recently learned that the whole “forced air floating a plastic ball” thing demonstrates Bernoulli’s principle of fluid dynamics. (A practical explanation can be viewed here.) Its application not only keeps plastic balls afloat for the amusement of young children. It’s also the basis of airplane flight.