Everything takes place in an infinitely greater field than what is framed by the size of the picture or by what is materially in the picture. This matter [door/window/wall] is but a support inviting the viewer to participate in the much larger game of a thousand and one visions and feelings; it is the talisman lifting or sinking walls into the deepest recesses of our spirit, opening and at times closing windows in the construction of our impotence, our bondage, or our freedom. The 'subject-matter' then may be found in the picture or it may exist solely inside the spectator's head.

'A Report on the Wall' 1970