Some comments from 2 years ago when this was previously posted:
https://news.ycombinator.com/item?id=11983716
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Can't check the other thread now, but just in case it wasn't there, here it is now, for your glassblowing pleasure, the great piece by Bert Haanstra called Glas (1958): https://www.youtube.com/watch?v=aLS7--ZLCoI