I'm now the proud owner of a real borosilicate Pyrex mug, courtesy of my late grandmother's basement, and I bet she would've gotten a kick out of the reason why I think it's cool (borosilicate is labware glass and Americans can't buy real Pyrex anymore)
also I think glass is an underrated material for cookware, it looks so much cooler than anything else. She also had a borosilicate glass Bundt cake form which I think I gotta save too just for how cool it is