You could point to the masts of the sailing ships in the harbor, perhaps, but one look at this photo and you know it's old, despite a lack of any firm tip-offs in its content. The moment that realization morphs into this is in color is where the fun begins. It's not unlike the appeal of Instagram filters, which can take something shot with a futuristic cameraphone in 2013 and (attempt) to fool our brains into placing it into another era. These photographs are the real deal, though, and to me, their power (even the colorizations) resonates far beyond their "filter"—they're starting with a level of authenticity that's impossible to fake, even with the best digital simulation. As of now, anyway!