Can you

a) mimic and actual camera lens with glass / ior?

b) look through a clear sheet that has a perturbation or normal that gets
progressively stronger toward the edges?

c) look though a partially transparent image map of the scene that somehow gets
rotated a little further the farther out toward the edge you get?

d) otherwise use overlapping image maps to imitate the photographic "circle of
confusion"?

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