images such as the plane of the glass in the window, the flat surface of the mirror, and the reflective surface of a pool of water, to explore imaginative contact with a world beyond the plane of vision: seeing, but seeing through. The world is not a brute fact but, like a myth or metaphor, semi-transparent, containing all its meaning within itself, yet pointing to something lying beyond itself.
Consider our reflection in the glass, requiring a slight manipulation of focus from the scen behind to the image upon the glass.
