Drop a CSV export from Goodreads, StoryGraph, or your own spreadsheet. Shelfspace looks for Title, Authors, ISBN/UID, Last Date Read, and Stars columns (fuzzy-matched, any order) and builds a real 3D library from exactly those rows — covers pulled from Open Library where an ISBN resolves, a plain deterministic spine where it doesn't. No invented titles, no server round-trip: the file is parsed and rendered entirely in this tab.