
Shabbat 15-16 People Who Live in Glass Houses These pages contain a discussion about at which historical point glass vessels were considered capable of becoming impure. The earliest option is the time of the zugot, Yosi Ben Yoezer and Yosi Ben Yochanan, 2 nd century BCE, then the suggestion is eighty years before the destruction of the Temple (late 1 st century BCE) and finally the time of Usha (2 nd century CE). We also hear about how glass is similar to and also different from both earthenware and metal vessels. So what do we know about glassmaking? Glass production started at least five thousand years ago in Mesopotamia. Egypt was an important center for it. As far as we know, glass was not manufactured in the land of Israel but glass objects were imported here. This glass was beautiful but not transparent or even translucent. Glass pieces from the manufacturing process were reused (important for our daf – glass can be fixed, i.e., made into a new vessel). For s...