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Allow me to overlay a side-view diagram of the Shenzhou reentry capsule (borrowed from this wikipedia diagram, and adapted for transparency) on top of your photo: Now your brain is seeing through the optical illusion: one of the flags is obscuring the curve of the capsule's top, and you can realize that the bottom-left corner is not the capsule itself, but ...


As asdfex says, it's an illusion caused by the photo angle and lighting, the cylindrical sides form a sharp angle with the (very much flattened) base. This photo shows the base of a Shenzhou spacecraft from a slightly different angle. Image credit: theregister.com As you can see, the base is convex, not flat, and its circumference has a ring of evenly ...

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