A wall

Our ability to assemble meaning from fragments may be seen, for instance, in finding a right exist from a highway at night in the rain by peering at faint blurry images spreading across a streaked windshield. A technique for imagining scenes and figures recommended to artists by Leonardo de Vinci, (and independently by others, cross-culturally,) shows the same power:

You should look at certain walls stained with tamp, or at stones of uneven colours….you will see there battles and strange figures in violent action, expressions of faces and clothes and an infinity of things which you will be able to reduce to their complete and proper forms. In such walls the same thing happens as in the sound of bells, in whose stroke you may find every named word which you can imagine ~ Page 44