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WHY THE LIGHT TRAVELL STRAIGHT
It is commonly believed that light travels in a straight line, which is essentially correct. Light explores all paths between locations, and the path of least resistance is chosen, which is usually the straight line. Light wishes to travel in a method that will yield the shortest time, and this is always a straight line in a three-dimensional universe and is in keeping with Fermat's Principle of Least Time. The Least Time principle is always satisfied by a straight line in three-dimensional, Euclidean space, but the problem is that this is not the only way of understanding the universe.


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