Most marbles are made using a pretty plain industrial process—melt some glass, cut it into pieces, and run it through automated rollers to shape it into spheres. But how are the super-fancy marbles made? With diligent crafting, a lot of fire, and lots of colorful glass strips.

In this five-minute video, we see both kinds of marbles (plain and handmade) being made. The attention and care that goes into this process is frankly staggering. Enjoy:

In case you're curious, the process for making Millefiori glass paperweights is somewhat similar, though it's a two-person job. I have one of these on my desk right now!