A short animated film explaining a classic graph theory puzzle and its solution. This was the first film produced by Bruce and Katharine Cornwell, and was selected for the 13th International Edinburgh Film Festival and the Educational Film Library Association's American Film Festival, both in 1959. It uses a simple visual approach to explain an abstract mathematical proof, defining a style that would be their signature across a 20-year career of producing animated educational films.

This is a digital transfer from a VHS scan of a 16mm print, so unfortunately it is not prime quality. If anyone locates a 16mm print of this, please let me know. Original copyright by Bruce Cornwell; released under Creative Commons license by son Eric Cornwell, 2014, including the music box recording and narration. For more please see vimeo.com/channels/bkcfilms

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