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I am creating a humanoid species for my setting and I thought of the idea of ​​making it that can rotate its joints with a 360 angle and can bend its limbs in any direction. Sort of like owl's 270 degree neck rotation but in every joint in the body (knees, wrists, hips, ankles etc). Moving my own joints, I came to the conclusion that the shoulder is the type if joint that mostly resembles the one I am describing, despite not being able to do full 360 rotations.

Would this be possible? And how could it be?

Maybe there are some joints in particular that simply cannot be fully rotatable and/or foldable?

Thank you in advance.

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    $\begingroup$ i remember theres some human with abnormality or disease that make them can rotate 360 degree, one that i manage to found from google is rubber boy so maybe try check that. $\endgroup$ – Li Jun Feb 14 at 12:30
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    $\begingroup$ With a single joint? An owl’s neck is multiple vertebrae that each do a bit of the turn, and if you try to you (as a human being) can get your hand to do a continuous 360 spin if you utilise your wrist, elbow and shoulder concurrently. $\endgroup$ – Joe Bloggs Feb 14 at 12:45
  • $\begingroup$ Thumb twiddling. $\endgroup$ – AlexP Feb 14 at 12:55

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