But subordinate edges, like the metal railings or the edge of the column, are blended and lost in the reflection. They might show up in a high-speed photo of the reflections (assuming the scene were real), but I don’t think the human eye would perceive them in real life.

This is a detail of the painting of Chandara from the new Dinotopia book. For a reflection like this, which follows the architecture very exactly, the perspective must be carefully constructed, even though the final reflections are painted quickly and gesturally.

The architectural forms in the reflection are drawn to the same vanishing points as the real forms in the scene. It’s not the same 2-D image inverted. That’s why the slope of the eves on the real projecting bay window (1) are different from the slope of the same forms in the reflection (2).
Perhaps there’s a broader lesson here about the artistic state of mind. I believe that the act of painting often consists of this strange combination of precision and freedom, accuracy and looseness. We need to think about physics and geometry, but at the same time, we have to surrender to an irrational impulse.
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