tldr; shingles don't care, light does
physics magic you can't fake, stay away from that two dollar hooker be-cause of effects. it is some
ODB green and still no squirrel
tail.
It can be either shadow or reflection, light is like Shingles it don't care. You can not fake physics (I mean digitally you can but it looks like that two dollar hooker who gives out four dollar refunds in that one back alley in town that even heroin addicts warn you not to go too, through or even around it anytime of day or night) the way light acts, reacts upon an environmental surfaces, some of which are reflective, dull, transparent, opaque. Light has very specific response to these environmental surfaces and of the many (incident) ray effects (responses) from light and (any) combined surfaces and light doesn't care if it is a shadow or reflection cast on a surface, the (response) effect occurs the same with either due to, that light is the precursor of the (response) ray effect not a derivative of (incident) or any other ray effects.
So its some ODB green variation eh?
Still no squirrel tail hanging out from trunk
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
... not that I think there should be a squirrel tail hanging out from the trunk hint hint, wink wink, cough cough.
reference
no squirrel tail