Why this page exists. This project's central methodological claim is that the surviving record has holes, so its own dataset discloses its holes the same way. Most corpus photographs show an ornament whose building nobody has yet placed. Rather than guessing, the corpus keeps those rows out of its geographic statistics and lists them here, each with the signals it carries and the evidence that would close the case. The signal cues below are research starting points read from styling and construction, not conclusions. A way to submit an identification is in preparation; each case links its full specimen record, which can be shared as a permanent URL.
The case grouping is generated from the corpus by the same audit that produces the project's internal research report, so this page cannot drift from the data: every row is computed at load from the published corpus CSV and the audit's signal classification. Identified specimens carry their location in the corpus index and on the world map there.
One honesty note: a signal cue is a prior, not a finding. A mansard roof with a fleur motif appears on Haussmann apartment blocks in Paris and on American Second Empire row houses alike. Cases move out of this ledger only when a location is verified against a source, never on style alone.