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Manhattan, New York, U.S. - May 21, 2014 - At 30 Rockefeller Center 50th Street side entrance lobby, a vistor can see ceiling Mural by Spanish muralist Jose Maria Sert. It is one of four in lobby showing Man's Conquests. Sert used perspective to create optical illusion, so man astride the two columns in front of entrance door appears centered when viewer sees it from center of lobby, but man looks leaning to left when viewed from left side of lobby, and leaning to right when viewed from right side of lobby. Subjects proportionally bigger the closer to ceiling so viewers from floor level would view scene in proper perspective.