The artist and longtime New Yorker was at LaGuardia Airport when the World Trade Center was attacked on September 11, 2001, and spent hours walking home contemplating how the world would change. Two decades later, he unveils a solo exhibition in Milan that features a memorial to the attacks. The work itself is a black resin tower cut through the form of an airplane—a monumental work that he tried bringing to the Guggenheim, but which then chief curator Nancy Spector was “hesitant at best” to show. In an interview with the curators, Cattelan describes the work, called Blind, as “about pain and its social dimension—it’s there to show the fragility of a society where loneliness and egotism are on the rise.”