Mr. Warren, who among other things did groundbreaking work for Absolut vodka, bristled at the suggestion that he had stolen the design.“I do my own thinking, man,” he said. “Feel free to come to one of my classes at Parsons.”He added: “I have a long and storied history on Madison Avenue. I’m not stupid enough to steal anybody’s work; I have too much faith to come up with my own ideas.”As for Mr. Porostocky, Mr. Warren said, “Tell the other guy to Google my name.