Could be low light, glare, or an angle the index doesn't have yet. Every stop has a lookup code as a guaranteed fallback — printed on the small plaque beside the piece.
Step 3 of 4 in the recognition fallback ladder — see the full pipeline
Older devices without ARKit/ARCore support skip straight here — no dead end, same content, delivered as a full-screen media card instead of an overlay.
View full content instead