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The Time Traveller points out that time itself is a dimension, just like height, depth, and width. He compares our restricted movement through time to being dropped from fifty feet at the first moment of our existence. Since we would be unaware of any other direction of movement, we would be unaware of height as an actual dimension. Also, portraits of a man at three different ages can be seen as a cross section of the same unchanging individual -- cross sections through time. At present, we can only move backward through time via the fleeting mind and memory. But just as humans conquered gravity by means of balloons, we can also come to control our movement back and forth through time. To illustrate the point, the Time Traveller brings out a tiny model of the Time Machine and sends it off into the future, although he comments he is not sure whether it is really into the future or the past.
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