Well, there are a bunch of games with transparent bits.

Which game is that funky white die from?

It's from Lord of the Rings.

Also, there are too many games titled "Lord of the Rings"

One of those pieces does not look white at all.

By the way, white is my preferred color...because it is the absence of color.

Yeah, that's a sugar barrel from Puerto Rico. I probably should have left it out, but it was white enough.

Isn't it the opposite ? Black is the absence of color and white is the mix of all colors (white light).

I have to protest against the notion that either white or black is somehow not a colour.

The phenomenon that gives rise to the perception of colour is light (a more or less arbitrarily chosen band of wavelengths of electromagnetic radiation). Light does not have a colour per se, but the more complex property of wavelength distribution (its spectrum). Similarly, the objects to which we ascribe a colour absorbs some light and reflects some, depending on its wavelength. The light that reach our eyes have a spectrum that for each wavelength is the product of the value for that wavelength in the spectrum of the light source and in the object's non-absorption spectrum. As wavelength is a continuous property, a spectum has infinite dimensionality, but the human eye has only three receptor types that are active in well-lit conditions. Now each of these has a wavelength-dependent sensitivity, i.e. a spectrum of their own.

From here on it gets simpler, though. After these three spectra have been applied to the combined spectrum of the stimulus, all information about wavelength is lost and only the amount of radiation (weighted by the three sensitivity spectra) is preserved, and we have a very coarse three dimensional representation of the stimulus' spectrum. This sounds familiar to those who are used to mixing colours from three basic components, such as pigments (often cyan, magenta and yellow; in printing supplemented by black for enhanced contrast) or light sources (often red, green and blue).

There is a further twist, of course: the three receptor spectra corresponds neither to red, green and blue nor to cyan, magenta and yellow,; not even to colours that psychologically appears to be "purer" colours than others. The three receptor types, called L, M and S (for long, medium and short wavelengths, i.e. red-orange-yellow, yellow-green and green-blue) are wired together to yield sums and differences like this:

L minus M = redness
M minus L = greenness
L+M minus S = yellowness
S minus L+M = blueness
high L+M+S = whiteness
low L+M+S = blackness

("High" and "low" in the last pair means relative to other points in the area of vision. The same is true for the others: a green object looks greener in red surroundings.)

Because of this mechanism, humans with fully developed and intact colour vision perceives colour in a conceptual space shaped like a D8 (to somehow tie this rant to gaming), with red-green, blue-yellow and black-white at pairs of opposing corners, and grey at the center.

Admittedly, the black-grey-white axis is somewhat different from the others, and are sometimes termed non-chromatic or acromatic colours. However, that is no reason to single out one point of this axis as a non-colour.

Depends if you're talking about pigment or light.