Moth blogging!

Camouflage is neat. I spotted this critter on the concrete wall surrounding a series of benches. Either none of the half-dozen people nearby noticed, or they simply don't care about moths. It's pretty incredibly in either case, since the wingspan was probably ~6 inches.  
 

The Internet suggests it might be a Pandorus sphinx moth, though I certainly don't know for sure. It also looks rather like a gypsy moth.