If you stand in a certain spot near the Philadelphia Museum of Art and look down the length of Benjamin Franklin Parkway, an artistic lineage unfolds: three works by three generations of Calders. In the distance, the 37-foot-tall bronze statue of William Penn by Alexander Milne Calder (the 20th-century sculptor’s grandfather, who lived in the city for 55 years) looms atop the elaborate architectural confection of City Hall. Midway, his son, Alexander Stirling Calder, posed three reclining Art Deco figures in a fountain , representing the three main waterways of the city. (When the fountain opened during a heat wave in 1924, thousands of people danced the tango in the streets to celebrate it.) And then, inside the museum hangs a mobile by the most famous Calder of all, Alexander Calder,

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