Two rooms can use the identical species, the identical finish, and still read completely differently depending on one decision made before fabrication ever begins: how the grain was sequenced across the panels.
Sequence, not selection
Grain matching isn't about picking the best-looking individual boards — it's about keeping boards from the same flitch in the order they were cut, so the grain continues from panel to panel instead of resetting at every seam.
Done well, the seam between two panels becomes difficult to find from a few feet away. Done poorly, or skipped entirely, even expensive material can read as assembled rather than considered.
Where it matters most
The effect compounds at scale — a single cabinet door barely shows it, but a floor-to-ceiling wall or a run of kitchen cabinetry either reads as one surface or as a collection of parts, almost entirely because of this one sequencing decision.