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The number of different shapes, sizes, and configurations of claimed UFOs has been large, with descriptions of chevrons, equilateral triangles, spheres, domes, diamonds, shapeless black masses, eggs, and cylinders. Skeptics argue this diversity of shapes, size and configurations points to a socio-psychological explanation. Other researchers argue that the large diversity of UFO shapes points to a possible paraphysical origin. Still others argue that there is a large diversity in the shapes and sizes of human flying craft, reflecting different origins, propulsion systems, and purposes, so such diversity in UFOs is not necessarily unexpected or inexplicable.