We recently saw what the insides of a bowling ball looked like. Now see those balls get that way in this clip from How It’s Made, starting out with a soupy goo for its core, wrapped in polymer and polyurethane layers, and then sanded. We were most surprised by the odd shape of the core.
Woodworker Carl Jacobsen made quite the mess in his shop for this experiment, in which he decided to turn a bowling ball on his lathe, chiseling away the ball’s outer surface and inner core to produce a surprisingly pleasing bowl. Carl says the biggest issue was the smell its core made.