What does Ellen discover in Dr. Gardner's office in the book, We Love You, Charlie Freeman: A Novel?

Dr. Gardner’s office is located in the Toneybee Institute, and is where he runs the Institute and conducts some of his work. The office is visited by Ellen and Nadine when they confront Gardner over his practices. Gardner denies anything unethical, but it is in his office that Ellen discovers the truth. Despite his seeming opposition to blacks and chimpanzees being compared, Gardner has done the exact same thing with his drawings of Ellen’s genitalia.