"A Spirit and a Vision are not, as the modern philosophy supposes, a cloudy vapour, or a nothing: they are organized and minutely articulated beyond all that the mortal and perishing nature can produce...  The painter... asserts that all his imaginations appear to him infinitely more perfect and more minutely organized than anything seen by mortal eye.  Spirits are organized men." 

William Blake, in Raine 1970, p.8