Three mathematicians are shown a cube and asked to describe what they see. The first a geometer, says, "I see a cube." The second is a graph theorist . She ventures, "I see eight points, connected by twelve edges." The third, a topologist, declares, "I see a sphere" The joke encapsulates the worldview of mathematicians belonging to different disciplines. Everybody sees what he or she wants to see and it's blind to much else. Topologists are blind to angles, distances and the exact shape of the objects of their interest.- George G. Szpiro
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