Katharina Grosse, Untitled, 2003 Acrylic on wall, 29 feet ⅜ inches × 57 feet 5 inches × 77 feet 1 ¼ inches (8.9 × 17.5 × 23.5 m), Pearson International Airport, Toronto© Katharina Grosse and VG Bild-Kunst, Bonn, Germany 2018. Photo: Isaac Applebaum