Public space is political space. When a work of public art is put up or taken down, it is an inherently political statement, and the work's aesthetics are inextricably entwined with its political valences. Democracy's openness allows public art to explore its values critically and to suggest new ones. However, it also facilitates artworks that can surreptitiously or fortuitously undermine democratic values. Today, as bigotry and authoritarianism...