Rehere

Rehere helps someone who remembers a place that can no longer be visited show it to the people they love, using old photographs and the memories they share. The viewer can always tell what a photograph shows, what a person remembers, and what a model guesses. A photograph becomes a partial 3D scene. Unseen surfaces stay empty. A memory can lead to one bounded model proposal, which the owner previews and approves before it becomes a new saved version. Earlier versions remain available. In the video, three synthetic contributors each share a different memory of the Penn Station clock; each becomes a live Muse Spark proposal (one only after Muse Spark asks a clarifying question), which the owner previews and saves as a separate alternative while the original stays unchanged. Those empty areas are labelled. Depth comes from a local model. Outlines come from SAM 2.1, running locally, which is the default, or from SAM 3.1 on the Meta Model API, which is optional. The geometry tears beyond about 10 degrees from the photograph's viewpoint. This is not a walkable room. When the optional planner is on, that proposal comes from Muse Spark (muse-spark-1.3). If the note is ambiguous, Muse Spark asks a question instead. Muse Voice Transcribe, also optional, drafts captions for a recorded story, and the owner reviews them before a visitor sees them. In an owner-only check, Muse Spark says which parts of a note the chosen photographs support, conflict with, or cannot show. That check is not a verdict on what happened. A visitor opens a link with no account. When a contributor withdraws a contribution, the shared views that depend on it stop being served. The video's example is New York's original Penn Station, demolished in 1963: the above-ground station, not the station trains use today. Demolition began on 28 October 1963. The photographs are Cervin Robinson, 24 April 1962, Historic American Buildings Survey NY-5471, photo 9 (concourse clock) and photo 8 (benches). On-screen credit: Cervin Robinson, 1962. HABS NY-5471. U.S. Government work. No known restrictions on images made by the U.S. Government. The story and notes in the demonstration are synthetic and labelled. They are not a real person's memory. This has not been tried with people who remember the station. The frozen, read-only demo uses New York's original Penn Station: https://beomseogkim.github.io/rehere/ Saved version 1 includes the synthetic story; Saved version 2 contains the owner-approved hypothetical clock turn. Its outline comes from local SAM 2.1, not SAM 3.1. Withdrawal is enforced in the running app; that offline copy does not change. Setup for the app: https://github.com/BeomSeogKim/rehere Built during the Meta Global AI Developer Hackathon (October 27 – November 4, 2026). License: Apache-2.0.