An art student painted 20 unauthorized portraits of Fed Chairman Alan Greenspan. Hoping to raise some money, he put them on sale in a gallery in Sag Harbor. “From the moment the Greenspan images appeared, people began wandering in off the street to gaze at the paintings, which capture the Fed chairman’s face in a variety of expressions ranging from exasperation to perplexity to mirthful amusement. Titles of the works include “If You Say So,” “I Gotta Tell Ya” and “Humpf.” Several visitors to the gallery bought paintings, telling stories of how they adored the Fed chairman, how he had saved the world and made them millions.”