I did not know a shadow could glow.

I would have said one can’t.
I would have been wrong.
What is it?
Here is the source: 
These photos actually were taken almost exactly a year ago (so much for timely delivery), but I still think they make an interesting “Visual Experience.” I hope you do too.
IMAGES: All photos were taken by me, Jan S. Gephardt, on August 18, 2014. They are my work, though you have permission to use them, provided you don’t alter them, and give an attribution and link back to this blog! The car is a 2009 Cadillac CTS, in case you wondered.