Color online) The meaning of tilting the head by 90 degrees.

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Figure 1 British Journal of Ophthalmology

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Jean-Pierre ECKMANN, Professor Emeritus, PhD, University of Geneva, Genève, UNIGE, Department of Theoretical Physics

Degrees of freedom of the human head described by rotation angles [1].

Jean-Pierre ECKMANN, Professor Emeritus, PhD, University of Geneva, Genève, UNIGE, Department of Theoretical Physics

What is blocking the human head from rotating more than 90 degrees in each side? - Quora

PDF) Broken Pencils and Moving Rulers: After an unpublished book by Mitchell Feigenbaum

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