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Google GEOID, or read the Wiki on this one. It is supposed to be the shape of the earth if the continents sank and water flowed to 'sea level' with gravity being different at locations on earth. This ball is highly exaggerated. In the reality, the highest point would be about 90 meters above mean sea level, and the lowest about 90 meters below mean sea level. This model has a hole at the north and south pole to let the manufacturing dust out. The picture is blue, yours will come in white nylon.