Rays ~ Captured 5th August by Tamás Ábrahám at Zsámbék, Hungary. ©Tamás Ábrahám, shown with permission.
Atmospheric
Optics

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Rays and shadows course over the sky. Always downwards (except when the sun is very low indeed) even though our eye/brain tells us otherwise. That the rays often fail to start at the cloud itself but after a pause for a darker shadow is geometrically puzzling.

For those who paint, this cloud's palette is below. Who said that clouds are gray or white? The hues are directly sampled from the lower image.