 Circus World, originally known as Child's World, was founded in Michigan in 1964, by engineer Sidney Rubin (born 1937), who served as the company president.Rubin was once a first baseman, and also worked as an army radar instructor before working as a systems analyst for Sperry Rand during the mid-1960s.Wanting to start a business in Detroit, Rubin realized that Michigan was ranked fourth in the United States in terms of youth population under 17 years of age.