I never realized (or forgot) how much of NeXTstep’s visual distinctiveness owed to the 2-bit monochrome monitor (white, black, light and dark gray) they introduced alongside the NeXTstation in 1990.
Which means that for the first two years the OS was… black and white? Visuals are otherwise completely identical, and they look so wrong with white button faces that I want to assume the shades-of-gray monitor was planned from the start.
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