My invitation to devise a little experiment with time is a good example of how ideas grow in the mind. As I explained, the experiment has been done before ; and it was probably serendipitous. Like most experiments, in itself it is of little moment ; but, like a small mustard seed, it has potential for growth provided it is planted in a fertile mind ; a mind that is regularly turned over and with lots of compost in it.
First, imagine the experiment to be done. Imagine sitting (with sandwiches and the Thermos) on a hillside that overlooks a winding country lane some way below ; the lane is hedged on both sides and there are trees here and there ; also you see fields, some arable, some meadow. And, casting your gaze from left to right along the lane, you notice first a cottage, then a large oak a few hundred yards further on, and then further on a cow showing an intense interest in the lush grass in the verge – grass that it cannot reach.
With this glorious panorama in your mind, you then notice a man coming into view ; he is walking along the lane, entering from your left. You wonder what he is doing there. Clearly he is going somewhere. He has a purpose. Is he going to the cottage? Is he intent on climbing the oak? Does he have an appointment with the cow? Or is he making his way along the entire length of the lane and out of your field of vision? You don’t know, so you watch and wait.
You notice that, because of the hedges and bends in the lane, the man cannot see the cottage or the oak or the cow all at once. He must encounter them one at a time.
He passes the cottage and looks at it. You realise that, while he is able to see the cottage, it is in his present time ; but that, once he is out of sight of it, then it is in his past time. He can know the cottage only from his memory. But – for you, the cottage is still in your present time.
When he reaches the oak, it enters into his present time from out of his future time. But, again, for you, the oak had always been in your present time ; and it remains so even when it has entered his past time.
At this stage, of course, the cow is in his future time and he has no idea that it even exists, except as a possibility. But you have all along known it to be there.
So, you see, this Time thing seem to be all about points of view. And it seems to be bound up with Space. A number of people in the nineteenth century pondered this experiment, and between them came up with some very interesting ideas. But the question of space/time is far from settled, even today.
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