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ATOPTICS "The complexity arises from the shape of the water surface. Ordinary mirrors are flat, convex or concave. They produce simple and single images. They have a fixed curvature.
In contrast, wavy water even at a single 'frozen' instant changes in its curvature from point to point along its surface. Its troughs are certainly concave at their deepest but the curvature decreases towards the crests passing through an inflection point and then becoming convex. And that is only in one dimension, the curvature alters differently in others."
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