Seckel, Al. Incredible visual illusions / Al Seckel. - London : Arcturus, 2004. - 256 p. : ill. (some col.), ports. (some col.) ; 28 cm. ISBN: 0572030223 (pbk.) 9780572030223 (pbk.) Subjects--Topical Terms: Optical illusions. Dewey Class. No.: 152.148 / SEC