Emu

The kind of neutral that changes name depending on the light, though the true neutral underneath it stays put. 0549, from Vista Paint.

At 2.5 on the chroma scale, this is closer to grey than to color, though the true neutral keeps it from being either. The true neutral is more noticeable under cool, daylight-balanced bulbs than under standard warm ones, which tend to mute it.

18.0 on the light-reflectance scale puts it in the middle third, which is the part of the scale with the fewest surprises. A safe whole-house choice when different rooms get different amounts of natural light, since neutrals shift the least across exposures.

Sherwin-Williams Gray Screen makes a good second wall color here - different enough to read as a real choice, close enough to still feel related (about 40.5 points apart in light reflectance).

By the numbers, Benjamin Moore Gray Mountain (1462) and this color are indistinguishable - delta-E 0.82, well under what the eye can separate. Only 2 other-brand colors land within delta-E 2 of this one, which makes it comparatively unusual. Matte or low-sheen suits it on walls; higher gloss will exaggerate the undertone.

It is lighter than 16 percent of the Vista Paint range. Vista Paint lists it in the C codes, alongside 1,421 other colors.