From The New York Times:
_[T]hanks to decades of research into ungulate vision combined with the latest in military concealment technology, hunters can don a computer-generated camouflage with fractal designs that look nothing like a shrub or a tree, at least not to the human eye. Named Optifade, it’s being introduced this fall by W.L. Gore (the makers of the breathable Gore-Tex rain gear) and promoted as the first camouflage scientifically designed to make hunters invisible to deer. . . .
“A camouflage that makes a person look like a tree can work if you’re in a place where other trees look like that,” Dr. [Jay] Neitz says. “But what if you’re somewhere else, or if the deer sees you move? This new camouflage is a totally different approach. It fools the deer’s vision system at its roots, so that it doesn’t recognize the person as anything.”_