Excursion In Diagrammatic Algebra, An: Turning A Sphere From Red To Blue - J Scott (Univ Of South Alabama Carter - Bog

Gives a description of one of the most beautiful and complicated examples in low-dimensional topology. This text describes the essential topological ideas through metaphors that are experienced in everyday life: shadows, the human form, the intersections between walls, and the creases in a shirt or a pair of trousers.