Mind-Boggling

"What amazes me the most," my shadow said, gesturing widely - possibly at me, though it was hard to tell, cast up against the wall as it was, "other than that whole so-called 'third' dimension, which honestly sounds a bit whiffy if you ask me, is how you manage to get the bright lights to appear around you every time you show up.  Especially that big one, the one that moves in the blue field; it doesn't even have a switch.  It seems like just once you'd forget them.  Wouldn't that be weird?  Objects without light to cast shadows from?"