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    $\begingroup$ @gerrit, that would depend on many things. The human visual system does not create a static mapping between a particular spectrum and a single perceived color. Instead as lighting conditions and spectra change, our visual system re-evaluates and changes perception. It allows us to see "white" things in broad daylight as well as evening twilight. As such, a "flat" spectrum would be interpreted depending on what else was seen close to it in time and space. There is no context-independent answer. $\endgroup$
    – BowlOfRed
    Commented Jul 30, 2014 at 15:49
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    $\begingroup$ This is the basis of this classical optical illusion. Perceived colour is (strongly) context-dependent. $\endgroup$
    – Emilio Pisanty
    Commented Jul 30, 2014 at 18:01
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    $\begingroup$ @EmilioPisanty - Here's another optical illusion of the same ilk. $\endgroup$
    – David Hammen
    Commented Jul 30, 2014 at 18:47
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    $\begingroup$ @DavidHammen - I love that one. When you put your finger over 90% of the center, and then shift it slightly so that it covers the whole center and then not, you can almost watch your eyes reevaluating the colors in regards to each other. Or at least I can... $\endgroup$
    – Bobson
    Commented Jul 30, 2014 at 21:11
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    $\begingroup$ White, gray and black are actually the same color. Just like bright red, red and dark red are "reds". Gray is just dark white and black is very dark white. You're just changing the luminosity. Not the hue or even saturation. $\endgroup$
    – slebetman
    Commented Jul 31, 2014 at 4:12