Gerhard Richter (b. 1932)

'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 in a letter to Edy de Wilde in 1975 in: Gerhard Richter: Text. Writings, Interviews and Letters 1961-2007, London 2009, p. 92).