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From  a speech given by the late Douglas Adams (of Hitchhiker’s Guide to The Galaxy fame) at a conference nearly 10 years ago:

“….The fact that we live at the bottom of a deep gravity well, on the surface of a gas covered planet going around a nuclear fireball 90 million miles away and think this to be normal is obviously some indication of how skewed our perspective tends to be, but we have done various things over intellectual history to slowly correct some of our misapprehensions. Curiously enough, quite a lot of these have come from sand, so let's talk about the four ages of sand.

From sand we make glass, from glass we make lenses and from lenses we make telescopes. When the great early astronomers, Copernicus, Galileo and others turned their telescopes on the heavens and discovered that the Universe was an astonishingly different place than we expected and that, far from the world being most of the Universe, with just a few little bright lights going around it, it turned out - and this took a long, long, long time to sink in - that it is just one tiny little speck going round a little nuclear fireball, which is one of millions and millions and millions that make up this particular galaxy and our galaxy is one of millions or billions that make up the Universe and that then we are also faced with the possibility that there may be billions of universes, that applied a little bit of a corrective to the perspective that the Universe was ours.