Why was Piet Mondrian’s 1909 exhibition at Amsterdam’s Stedelijk Museum important?

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Piet Mondrian Mondrian, photograph by Arnold Newman, 1942.

The 1909 exhibition at Amsterdam’s Stedelijk Museum was a pivotal moment in Piet Mondrian’s career because it featured his Luminist works in a large group show. This presentation firmly established him as a recognized member of the Dutch avant-garde.1