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The objects have a map shape of a sphere, and the poles of the sphere are parallel to the y-axis. At the object’s "North Pole" and "South Pole", the squares of the texture map become squeezed into pie-wedge shapes. Compare this slide to slide 12 which has a map shape of a cylinder. Both map shapes have the pie-wedge shapes at the poles, but there is a subtle difference at the object’s "equator". The spherical mapping stretches the squares in the texture map near the equator, and squeezes the squares as the longitude reaches a pole.