Subject: Re: As this is the Atheist forum...
Disclosure: I'm a physicist (by training/education).
Light is in no way metaphysical.

Clearly you've never taken LSD. If you had, you'd understand everything can be seen as metaphysical....until the acid wears off. Then reality returns and you realize the neon cactus lights at Pancho's Tacos were not divine beacons, and the burrito was not created in His Image.
But it was still a damn good burrito.