BERN.- Since his startling emergence on the art scene in the 1950s as a wild young Tachist, Rolf Iseli (b. 1934) has remained one of the best known Swiss artists. This retrospective exhibition at the Kunstmuseum Bern surveys the artist’s fifty-year-career by means of about one hundred works – large groups of paintings and drawings, sculptures and prints – which Iseli produced in his studio in Berne and in St. Romain in Burgundy. In 1957 Iseli caused a public sensation when he won the Swiss Federation Art Scholarship for a canvas covered in splashes of ink; Sam