Your reality has Mach banding. A spot of dithering will fix that. :-)
Yeah, I love these sort of images, "reality has a bug". Here's a similar one from Morgan McGuire about halfway down my post: http://www.realtimerendering.com/blog/visual-stuff/
Great shadow artifact.Thanks for sharing.
I sometimes see artifacts in the sun-sky, glitches like halos e.g., or an over saturated horizon ... (sidenote: I skipped my own implementation for picogen and use the one provided together with your paper, for sake of correctness and sureness :D)
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