In the first case, with our sense perceptions 100,000 times faster, all events in nature would appear to us 100,000 times slower. This would then be a stationary and immovable world. The only motion which we could see with our eyes would be that of the cannon ball, which would crawl slowly along, at less than a snail's pace. The express train going at sixty miles per hour would appear to stand still, and deliberate experiment be required to discover its motion. By noting its position on the track, and noting it again after a period of time as long as five minutes appears to us now, we should find its position changed by three inches. It would be a dangerous world, as there would be many objects--not distinguishable to the senses from other harmless objects--contact with which would be dangerous, even fatal; and one and the same object (as the express train) might sometimes be harmless (when at rest), sometimes dangerous (when in motion), without our senses being able to see any difference. On the other hand, with our sense perceptions 100,000 times slower, all events in nature would appear to us to occur 100,000 times faster. There would be little rest in nature, and we should see plants, and even stones, move. We should observe, in a period of time not longer than a minute or two appear to us now, a plant start from seed, grow up, flower, bring fruit, and die. Sun and moon would be luminous bands traversing the sky; day and night alternate seconds of light and darkness. Much of nature, all moving things, would be invisible to us. If I moved my arm, it would disappear, to reappear again when I held it still. It would be a usual occurrence to have somebody suddenly appear and just as suddenly disappear from our midst, or to see only a part of a body. The vanishing and the appearance of objects would be common occurrences in nature; and we should speak of "vanishing" and "appearing," instead of "moving" and "stopping." Collisions, usually harmless, with invisible objects would be common occurrences. As seen, nature and its laws would appear to us very different from what we find them now, with our present time perception. Thus philosophy, mathematics, and physical science agree that space and time cannot be entities, but are conceptions of the human mind in its relation to nature. But what does this mean, and what conclusions follow from it? The space of our conception is three-dimensional--that is, extended in three directions. For instance, the north-south direction, the east-west direction, and the up-down direction. Any place or "point" in space thus is located, relative to some other point, by giving its three distances from the latter, in three (arbitrarily chosen) directions. Time has only one dimension--that is, extends in one direction only, from the past to the future--and a moment or "point" in time thus is located, with reference to another point in time, by one time distance.