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Virtual Perpetual Calendars [ Teens / Mature Teens ] - Lets you know what any calendar looks like for the 20th and 21st centuries . Goss Gallery , on the corner of Cedar Springs and Fairmount in Dallas ' thriving Uptown neighborhood , is a contemporary art gallery reflecting the feel and program of leading galleries in London , Paris and New York , with exhibitions of 20th and 21st century contemporary painting and photography from both American and European artists . Candidates must have a doctorate in art history , strong administrative abilities and expertise in " the multiple modernisms of the 20th and 21st century . On the 20th and 21st , paper presentations and discussions . It 's the American way , a path blazed by the robber barons of the 19th century and followed diligently by the corporate swindlers of the 20th and 21st centuries .