When Mobilist Alexander Calder was only a tot 60 years ago, he would solemnly announce to those he had just met: "I am the third Alexander Calder living and the ninth dead."
To be the third living Alexander was something of a burden, for both his father and grandfather were sculptors famous in their day, and the implication was that he would have to carry on. He did. Last week, in a sentimental show, the Delaware Art Center in Wilmington put on a display of works by all three men. Alexander IX's mobiles were as engaging as ever, and the ancestral works...