"A local chemist, Charles Roberts, had examined the window and drew on his forty years of experience in analyzing glass. He explained that the iridescent stain had been produced by water deposits combined with weathering, yielding a chemical reaction like that often seen on old bottles. ?The culprit seems to be the sprinkler,? Roberts concluded (Norton 1996; Posner 1997).

Indeed, as I walked around the glass-faced building with Dr. Posner and another local skeptic, astronomy professor Jack H. Robinson, we could see that there were other iridescent flow patterns on windows, each at a sprinkler location. One, on the west wall, had been dubbed the ?Buddha? (Posner 1997)."