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We provide an illustration of a geometric structure that exhibits thespin-half wave-function characteristics, namely that its full rotation displaysa phase inversion. We show that general fractional-spin geometric structuresare possible, along with sketchy discussions concerning group-theoretical andquantum descriptions, as well as pose some queries. Synthesis of a$(PF_3)_n$-chain polymer in the form of a twisted ring is proposed as arealization of a quazi-spin-1/3 structure.

Illustration of spin-half wave-functions, and other fractional-spin structures