Per Kirkeby Quote

Thus it is with all pictures, there are many layers, and with good reason an analysis nearly always deals with the last [layer]. The last layer in a superficial sense. But how then can one talk of what one cannot see, the overpainted or wiped-off layers, how to go about for example, photographs that are like slates with layers which no longer exist. The answer is that they exists nevertheless, taken up into the visible layer by a rubbing-off, but the problem, on the whole, is how one deals with the visible layer. The angle-sure, viewpoint seeking and in the worse sense 'analytic' intercourse with the picture.

'Bravura', Per Kirkeby, (1982)