The lizard became the ESG mascot due to the popularity of Douglas Hofstadter’s 1979 book Gödel, Escher, Bach: An Eternal Golden Braid. Several creative ESGers painted a series of murals around ESG mimicking the tessellated lizards that were a common theme of M.C. Escher’s illustrations. Eventually, the lizard became the symbol of ESG, giving rise to the logo we know today.