"Lichtenstein was a classic Pop artist, categorically and definitively. His art is characterized not only by what is depicted equally by how it is made; the confluence of transposable subjects and indelible style is paramount, and in this, Lichtenstein never wavered. His disparate, and daringly indiscriminate, sources-an illustrated children's story, comic strips, product packaging, newspaper advertisements, mail-order catalogues, museum postcards, the yellow pages-are equalized by Lichtenstein's singular point of view. Inspiration as well as convictions regarding process, remains largely unchanged from the beginning to the end of his career-there is refinement, but no rupture. The core of his practice is to drain the particularity of an object or an image and impose his own affect."
(James Rondeau and Sheena Wagstaff, Roy Lichtenstein: A Retrospective, The Art Institute of Chicago, 2012. p. 23-24.)