From the Olmstead Building bathroom at the University of California Riverside:

I think Moaning Myrtle would agree. Don’t you?
Photo by Valarie Zapata, English Professor at Moreno Valley College. Used by permission.
Thanks to Greg Eiselein & Karin Westman for the tip, and to Professor Zapata for granting permission to post this.
Philip Nel
Philip Nel is Professor of English and Director of Kansas State University’s Program in Children’s Literature. His most recent books are Keywords for Children’s Literature 2nd edition (2021, co-edited with Lissa Paul and Nina Christensen), Was the Cat in the Hat Black?: The Hidden Racism of Children's Literature and the Need for Diverse Books (2017), Crockett Johnson and Ruth Krauss: How an Unlikely Couple Found Love, Dodged the FBI, and Transformed Children's Literature (2012), Tales for Little Rebels (2008, co-edited with Julia Mickenberg), The Annotated Cat (2007), and four volumes of Crockett Johnson's comic strip Barnaby (2013, 2014, 2016, 2020, all co-edited with Eric Reynolds).