Hi David,

I like your paper. You have described special relativity with great clarity. I hope you don't mind if I borrow some of your excellent figures for use in other contexts. I will give you credit. By the way, you don't need to use "POV" for the photon. Einstein used the phrase "frame of reference" which does not ascribe any inference of awareness to the photon. You did not get into special relativity in this paper. That is not a criticism. But it would change some of your analysis when you take acceleration and gravity into account. You correctly pointed out that in the photon's frame of reference, no time passes. Also, for the photon, the universe is a 2 dimensional surface normal to the path of the photon. This has to have some meanng in terms of the deeper fabric of space-time, but I don't know what it is.

Thanks,

John Karpinsky