I work with glass using the pâte de verre technique, the original method of making glass. I try to commune with those ancient craftsmen who toiled away at their craft, gathering sand and chemicals, sculpting vessels with wax, building plaster moulds, losing wax, charging glass powder, heating the charged moulds with wood fire and then removing the plaster after they cool down. With great sympathy, I have seen a glass bottle from ancient Egypt where the craftsman had got tired of scraping out the plaster from the interior of the vessel and left it in place.
The method was so cumbersome that it was abandoned when glass blowing was invented about 2000 years ago. That is why my glass pieces do not look like glass you normally see around you.