I have read this excerpt from "The Last Leaf" by O.Henrry Short Stories: The Last Leaf by O. Henry "An artist once discovered a valuable possibility in this street. (1) Suppose a collector with a bill for paints, paper and canvas should, in traversing this route, suddenly meet himself coming back, without a cent having been paid on account! So, to quaint old Greenwich Village the art people soon came prowling, hunting for north windows and eighteenth-century gables and Dutch attics and low rents." But I don't really the meaning of the sentence (1). I think the (1) is the reason for "an artist" to find Greenwich having a valuable possibility. And it results in "art people" coming to Greenwich. I don't know why (1) is that reason for this to happen. I also don't understand what is the "bill for paints, paper and canvas". Thank you for taking the trouble to help me.