who's watching whom?

Rare Book Division, The New York Public Library. "Three cats watching fish in an aquarium" The New York Public Library Digital Collections. 1938. http://digitalcollections.nypl.org/items/b992a521-9c85-2498-e040-e00a18063ad7

This illustration by Clyde A. Copson is from a children's book called "A Day with Bum; and the Smart Little Fish," by Morris Wilson, published in 1938.  I can't find anything about Copson or Wilson, but the record for this piece at the New York Public Library notes that the book was created under a Works Progress Administration program for new reading materials.