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He has a fairly exceptional visual memory, if not truly photographic, and even if it cannot truly hold details permanently.Watch some comparison videos for yourself and you can easily see that he draws the general outlines on the landscape and the major buildings very well. Beyond the most salient features though, he pretty much makes the rest of the background buildings up. Which is understandable, because real photographic memory does not exist.
There might be a day soon, however, when photographic memory is a very real thing. http://spectrum.ieee.org/biomedical/bionics/darpa-project-starts-building-human-memory-prosthetics
http://www.popsci.com/technology/ar...hip-rats-can-remember-and-forget-touch-button
It's fascinating what these devices do in rats- it basically bypasses the normal sorting process for memories in the hippocampus and forces them all to be permanently encoded with great detail in animal studies. Rats could have their memory boosted to a great degree from some of the early reports I read a few years back. The military wants these implants to minimize soldier training time and maximize the retention of said training, but I think it'll be interesting to see what happens when you put someone who can never forget in traumatic situations that they'll always recall with vivid detail. Sounds like a procedure that would run a very high risk of driving a soldier completely insane if they weren't incredibly mentally stable. At least, until someone back at base could hit the "off" switch and make them forget, but who knows how much they'd lose if we used that option...