Glass is an amorphous solid (and that’s not a contradiction in terms). It’s melted around 2,000 degrees fahrenheit. And yes, it’s made from sand—sort of. From stained glass windows at Notre Dame to Murano glass beads, you probably already know that the art of glassblowing is practiced worldwide, and has been for centuries. What you may not know is that it’s something even casual hobbyists can learn to do themselves in a workshop. We’ve assembled a series of 10 mind-altering facts about glassblowing that will give you a quick lesson in art history, stir your scientific curiosity, and hopefully inspire you to don a pair of gloves, grab a pipe, and blow your own wine tumblers before the month is out. From mold blowing to glory holes, and annealers to to crucibles, here’s the lowdown on the most fascinating aspects of the ancient art of glassblowing.