It takes time for our brains to process light. And it also takes time for them to process sound. BUT, because our auditory cortex is right next to our ears, and because it doesn't have to worry about any spatial aspects of sound (in the way that visual cortex has to, mapping each rod and cone to a bit of brain), sound gets processed faster than light! Considerably faster, in fact - sound gets to the brain in a usable form in a couple of milliseconds, but it's well over 50ms before light's finished getting there.
Pretty cool in itself, but now you have to factor in the point that light travels faster than sound to get to us. So, there's a point where the delay in sound reaching the ears EXACTLY CANCELS OUT the delay in visual processing, so that sound and light coming from that point will reach the brain at exactly the same time. It's called the "horizon of simultaneity", and it's about 10 metres from your body. In other words, you have an invisible ring around your body at all times, and if anyone is standing on it they're being extraordinarily kind to the bit of your brain that works very hard matching sound to light. So give them a cookie or something if they stand there.
CAMBRIDGE, MA–On what is now known as "Monday," a team of MIT scientists unveiled "time," a revolutionary new event-sequencing protocol which organizes phenomena along a four-dimensional axis, preventing everything from taking place at once. "No longer will the extinction of the dinosaurs, the assassination of John F. Kennedy, and the Earth-Xabraxiq Pod Wars all collapse into a single point," theoretical physicist Dr. Lawrence Chang said. "With time, we can now contextualize each of the universe's infinite number of occurrences in its own spatial-temporal plane, creating order where there once was chaos." Added Dr. Erno Toffel: "Using time, one event can be positioned chronologically so as to be the cause of another. For example, a man's death may result in a gun being fired at him. Or the other way around. We're still working out some of the kinks."
And what did we find? You were amazing! You were so pointlessly complicated! And yet it wasn't pointless; you were amazingly robust. And the forgetting! You see, our kind never forget anything. It's part of our design, and it's why we eventually have to die. Eventually we know so much we can no longer collate it all. But you deal with the problem in a way that both terrifies and fascinates us. You have lived subjectively and continuously a hundred times longer than any of us, yet you hardly remember any of it! We cannot imagine living in such ignorance of our own existence, yet we have to admit it's an elegant and workable compromise.
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