That's like...Deep...man...

So, we see things by light reflecting off of objects into our eyes. It takes time for light to travel, it takes time for our eyes to send a signal to your brain, and time for your brain to interpret the signal. Anytime we see something, we're really seeing how that object was a fraction of a second ago. We're always seeing the past. Never mention this fact to someone tripping on acid, they will stare at a wall for five and a half hours trying to "See the present"...