Cloudy
From an unsuspecting corner of a room, the many streaks of colours streaming in from a narrow space, because part of the light source is partially covered.
The wavelengths going at a palindromic sequence, from blue to green to yellow, to yellow to green to blue. A rainbow branching out in 2 directions.
P.S. Where refraction causes light to split up in a scintillating array of colours, now this is the rainbow reflection. Where light hits against a hard opaque surface to be 'reflected' in many colours.
