what legacy did it leave?
Gianni Versace once linked the pop art images via his gown designs.
Whaam!
 Gianni Versace once linked the two iconic pop art images via his gown designs. 
what is whaam? It is a diptych painting. what is meant by this term you mentioned just now? It is any object with two flat plates which are a pair, these are often attached at a hinge. how is it related to art? As an art term a diptych is an artwork consisting of two pieces or panels, that together create a singular art piece. who made the former painting? Roy Lichtenstein give one interpretation of it? UNANSWERABLE
wiki:10500160
Whaam! [SEP] Legacy
Detractors have raised concerns over Lichtenstein's appropriation, in that he directly references imagery from other sources in "Whaam!" and other works of the period. Some have denigrated it as mere copying, to which others have countered that Lichtenstein altered his sources in significant, creative ways. In response to claims of plagiarism, the Roy Lichtenstein Foundation has noted that publishers have never sued for copyright infringement, and that they never raised the issue when Lichtenstein's comics-derived work first gained attention in the 1960s. Other criticism centers on Lichtenstein's failure to credit the original artists of his sources; Ernesto Priego implicates National Periodicals in the case of "Whaam!", as the artists were never credited in the original comic books.