Describe Gatsby the first time Nick sees him in The Great Gatsby.

Nick first sees Gatsby at the end of Chapter I.  He describes him as "standing with his hands in his pockets...."(25).  Nick is about to talk to call out to him, but decides not to when "he stretched his arms together toward the water in a curious way..."(26).  Nick then says, "...I could have sworn he was trembling" (26). Nick tells us that he is simply assuming this is Gatsby, but this does turn out to be a correct assumption.  Nick does not actually need Gatsby until the end of Chapter III, and there are a few passages that describe Gatsby, particularly very famous description of Gatsby's smile.