Per Kirkeby is a Danish artist whose interest in geology and natural environments exerted great influence over his paintings and brick sculptures. Entrenched in the conceptual understanding of structures, Kirkeby worked within specific parameters to contain the urgency of mark making. “A structure-less painting is, to me, a painting that does not matter. Structure mirrors your degree of responsibility toward the work,” he once said. “You can't just let it float around in pretty colors. It needs a kind of core.” Born on September 1, 1938 in Copenhagen, Denmark, Kirkeby studied geology at the University of Copenhagen, but continued to pursue his art practice, producing paintings, sculpture, films, and prints. During...