Post-it, Publicolor, and The Office‘s Angela Kinsey unveiled the world’s largest billboard artwork created entirely of Post-its today at Grand Central, in honor of the stationery company’s 30th anniversary. The billboard features the designs of two high school seniors who won a national student art contest; conceptual artist Eric Daigh, famous for his push-pin portraits, transformed their winning work into towering 40′ x 44′ dimensions. Submissions from all 35 contest finalists, as well as the original winners’ work and its large-scale translation, will be on display in Grand Central’s Vanderbilt Hall through Friday.