For those who aren’t familiar, kobuki and Paul stankard are famous for their glass flowers
Heres a kobuki, his are all made on a torch with borosilicate glass which is harder to work with and has a much higher melting temperature. You could whip this against a concrete wall and it probably won’t even scratch.
Here’s a Paul stankard piece, made with soda lime or ‘soft glass’. The detail on these is incredible I can’t imagine how long they must take. He would make all the individual pieces on a torch then weld them all together with a tiny torch. Once the inside is complete the whole thing gets vacuum sealed into the pure clear glass. If you don’t do it perfectly your weeks of work will melt and distort in seconds. Crazy shit!