Langdon was also influenced greatly by the Taoist graphic symbol yin/yang, and the graphic work of M.C. Escher — both black and white representations of concepts that encourage viewing things from more than a single point of view. Unhappy with marginal success at designing words that would tessellate a plane like Escher's birds and fish, Langdon's discovery of the NEW MAN and VISTA logos (by Raymond Loewy and Dick Hess, respectively), which featured rotational symmetry, steered him in the direction of what later became known as ambigrams. The blend of his Taoist philosophy with ambigrams resulted in the 1992 publication of his book "Wordplay".