Francois Pinault is in Venice to sign an agreement wo build his new museum. “The agreement is for 30 years, during which Mr. Pinault is to make 141 works he has accumulated the basis of the new museum’s permanent collection. Two years ago Mr. Pinault bought the 18th-century Palazzo Grassi as a space to present exhibitions of his contemporary-art collection as well as of shows devoted to more historical art. The Japanese architect Tadao Ando, who renovated the Palazzo Grassi, is expected to begin work on the 17th-century Dogana building this fall.”