This description is sort-of helpful. But only sort-of, because I'm not sure the film's about any one thing, specifically. The architectural sensibilities and interests are obvious, and there are definite strains of "capturing images," as well. And I love the way the camera serves as a character or observer is thematic and great. But those are just loose connections of ideas. (It also reminded me of Interstellar. And of Gattaca. The former, because of the library. And the latter, because of the music and the architecture. But that's just a bit of free association.)
You know what? Just watch it. In full-screen and HD. Because that's the best/only way to figure out what's going on. (And then watch the "Compositing Breakdown" video and the "Making of the Exetor Shot" short, because they're great, as well. Unless you hate men behind curtains.)
Oh, and the sound work is just brilliant. Not as flashy or as obvious as the images, of course. But really adds oomph to the overall effect.
A FULL-CG animated piece that tries to illustrate architecture art across a photographic point of view where main subjects are already-built spaces. Sometimes in an abstract way. Sometimes surreal.