observatory
A slim brass-and-stone tower at the edge of the Gardens, older than the Conservatory's own spire and now overtopped by it. Its top chamber holds twelve great brass listening horns, each turned on a single bed below through an opening in the glass, and the instruments that turn a bloom's sentence into a spectrograph. Sylvia works here, and the Bureau's observers are given a desk on the floor below. At three in the morning the whole tower hums with the contracting glass of the Conservatory; nobody...
Located in The Architecture of Babel.