Rather than go the magnetic route, [Jacob] levitated a ping-pong ball on a cushion of air ... When [Jacob] switches a heavy ball for a light one, the lighter ball is pushed beyond the pre ...

You can see that there is a bright point on the top of each ping-pong ball because of this. On the other hand, in bright light you can still make out the time because of those bright spots ...

The indentations should pop right out. Finally, one note of caution for projects that upgrade ordinary string lights by placing ping pong balls over the LED bulbs: In 2023, the government recalled ...