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## Main Question or Discussion Point

I've been wondering about this for a while. If you were to take a perfect sphere and cut it in half so that you would see a circle and then use a magnifying glass to zoom in closer and closer on part of the circle, the arc would approach near flatness but it would never reach it so therefore since an arc is constantly changing it cannot be fully defined therefore perfect spheres cannot exist in the real world. What do you think?