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Self-expression values are part of a core value dimension in the modernization process.[1] Self-expression is a cluster of values that include social tolerance, life satisfaction, public expression and an aspiration to liberty. Ronald Inglehart, the University of Michigan professor who developed the theory of post-materialism, has worked extensively with this concept. The Inglehart–Welzel Cultural Map contrasts self-expression values with survival values, illustrating the changes in values across countries and generations.[2] The idea that the world is moving towards self-expression values was discussed at length in an article in the Economist.[3] Expressing one's personality, emotions, or ideas through art, music, or drama,[4] is a way to reveal oneself to others in a way that is special to them.[5]