Fifteen years ago a 7000-pound bronze charging bull mysteriously appeared on Wall Street outside the New York Stock Exchange. Now the artist who made it wants to sell, and bidding begins at $5 million. The sculpture is much beloved on the street and the artist insists “that any deal would require the buyer to donate the landmark sculpture to New York City, with the new owner’s name inscribed on a plaque to be placed next to it. The buyer would be allowed a tax deduction.”