= Icosian game
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The <Icosian game> made the <vertex>-visit puzzle tangible. The report of its 1857 presentation describes a plane projection of a regular <dodecahedron>, with holes at the <vertices> for ivory pins. The Trinity College Dublin archive connects this game with the search for closed routes visiting each <vertex> exactly once. This puzzle supplies a historical illustration of the <Hamilton cycle> requirement.<The Icosian Calculus, Hamilton papers archive>[The Icosian Calculus, Hamilton papers archive: opening historical introduction and quoted report of the 1857 British Association presentation: dodecahedron projection and ivory pins]{ref}
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