Gerhard Richter on Grey

Zwei Grau nebeneinander
(Two Greys Juxtaposed) 1966

Grey. It makes no statement whatever; it evokes neither feelings nor associations: it is really neither visible nor invisible. Its inconspicuousness gives it the capacity to mediate, to make visible, in a positively illusionistic way, like a photograph. It has the capacity that no other colour has, to make ‘nothing’ visible.
– Gerhard Richter, From a letter to Edy de Wilde, 23 February 1975