The Gooderham Building is well-known both for its narrow wedge shape and for the mural on its back wall. "The Flatiron Mural" by renowned Canadian artist Derek Michael Besant uses a "trompe-l'œil" effect to not only make the wall appear to have more windows than it does, but to also give it a more mobile effect by having its edges 'fluttering' away where they are not 'tacked' down. It is a picture of the Perkins Building, which is located directly across the street.