The squares are not drawn on a photograph. They are actually
painted on the two buildings, road, telephone pole, grass, etc.
Hardesty drew 2 tiny squares on a piece of clear acetate and
mounted it in a slide. He took a slide projector outside his
house at night and placed it on a table at eye height. He projected
the slide across these several surfaces. In the dark, he marked
with a grease pencil both sides of each line and where it fell.
The next morning, he filled those lines in with spray florescent
paint.
From any point of view other than this one, the florescent
lines appear to be meaningless random red dashes of different
thicknesses. But by standing exactly where the slide projector
had been, all the florescent lines join up and appear a uniform
width, re-creating the squares. This is a clever reversal of
what a painter does, i.e. render 3-D space, two-dimensionally.
Here a real 3-D space appears magically flat and vertical.
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