Ptolemy’s Wedge bares the name of Greek astronomer Claudius Ptolemaeus, who articulated the geocentric model in the year 148 in his influential book Almagest, though his theory was blown apart by Polish astronomer Nicolaus Copernicus in 1514. The soft, oxidized steel wedge, by New York artist Beverly Pepper, rises thirty feet above the ground, weighs 6,200 pounds, and can withstand winds of up to 100 miles per hour. Nicollet Mall & S. 4th St., Mpls.