Did you know that you can blow up soap bubbles and instantly freeze them into ice orbs?

If you’re searching for a fun cold-weather activity, this is worth trying out.

Popular Science explains the science behind bubble freeze, in addition to instructions on how to make one.

There’s some interesting science at play here. Every bubble is made up of three individual layers: a thin layer of water molecules squished between two layers of soap. It might look like the entire surface of the bubble is freezing, but what you’re actually seeing is the innermost layer of water—which freezes at warmer temperatures than soapy water—turning to ice within the film.

As the soapy water turns into ice crystals, the inside of the bubble appears to swirl around to create a beautiful effect of a snowglobe — very photographic!

But the ice bubbles don’t last forever, notes bubble photographer Chris Ratzlaff: “Bubbles are such ephemeral things,” he says. “To be able to literally freeze them in time is such a rare experience.”

Enjoy some more bubble freezing videos below: