Unconsciously the human eye adapts to different light conditions, while cameras need adjustment through white balance. The color temperature of different light sources is measured in Kelvin. 6500 Kelvin corresponds to the value of overcast daylight and is used as a standard for the neutral registration of white surfaces. 6500 is an essay film on the relativity of words, questioning the application of absolute values in an argument, visualized through a play on colors, their spaces, and their highly subjective perception. Quotes from Ludwig Wittgenstein’s “Remarks on Colour” emphasize this rhythmic flickering and slightly absurd conversation between colour and language.