Part of me is still wondering if this was faked with the help of CG, but after watching it twice, I’m inclined to think it’s real, and that’s also the consensus among the zillion sites where this viral video has already proliferated. Even if it’s fake, it’s an amazing concept, beautifully executed, and frankly mesmerizing. And if it’s really real — well, then, wow. Human capabilities just advanced a notch on the mind-blow meter.