Glass is the concrete negation of dwelling

Glass is the concrete negation of dwelling. Not only because architectural form drowns in it, but, because glass, when so used, renders visible those who seek shelter within it. [...] The language of absence here testifies to the absence of dwelling – to the consummate separation between building and dwelling which no heterotopia is capable of remedying. The "great glass windows" are the nullity, the silence of dwelling. They negate dwelling as they reflect the metropolis. And reflection only is permitted to these forms.

Massimo Cacciari, ‘Eupalinos or Architecture’ in Oppositions, 21 (M.I.T. Press, 1980) p. 114