sentences:  During his career, Adler performed before millions of circus fans in the United States.His image was placed onto at least two classic Ringling Bros. and Barnum & Bailey Circus posters, and a commercial mask resembling this face was created and sold by Verne Langdon.Felix Adler was once photographed by American designer Charles Eames for the latter's visual slide presentation accompanied by circus music, a photograph which today retains fame in the form of a cover for the compact disc "Circus Clown Calliope!