You try and imagine what it must have been like to first see something moving on a screen. It must have blown your mind, because up to then life went by and there was no way to capture it. You could only get one instant and you didn't get the movement. So it's like having a bit of control over time really, because it's happening in real time or what seems to be real time, and then you can play it backwards and you can watch things again and again.