Those who have been fortunate enough to visit the Rose Planetarium at the Museum of Natural History in New York will, no doubt remember the display outside the big spherical theater. The big sphere is about 85 feet in diameter and housed in a glass cubical building. Here's a picture:
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Once you leave the inside of the sphere, where you are treated to a wonderful visual experience detailing the immensity of the universe, you walk down a ramp that spirals around the sphere. Using the sphere as a reference, you are asked to ponder relative size. For instance, if the sphere was the sun, the size of earth would be about the size of a bicycle. If the size of the earth was the size of a basketball, our moon would be the size of a basketball. If a drop of water was the size of a basketball, the virus that causes the common cold would be the size of a golf ball. And so on, and so on.
It really makes one feel insignificant in the grand scheme of things.
I have had a similar experience but had a different line of thinking....an entire Universe to make just little ole' us!!
Greg