Gray makes no statement whatever... it evokes neither feelings nor associations: it is really neither visible nor invisible.
Gray 1s 2nconspicuousness gives it the capacity to mediate, to make visible, in a positively illusionistic way, like a photograph.
Gray is an important color - the ideal color for indifference, fence-sitting, keeping quiet, despair, in other words for states of being and situations that affect one, and for which one would like to find a visual expression.
Gray is uniquely capable of making 'nothing' visible. It is neither visible nor invisible. It makes no statement whatever and evokes neither feelings nor associations: Its inconspicuousness gives it the capacity to mediate.
Gray is one of the sky's colors that makes other rich colors (i.e. Sky-blue, the color of poppies and geraniums) actually look more luminous, because they are seen against a sombre background and seem to be burning with a lustre of their own.