Yrjo Kukkapuro, a Finnish furniture designer known for his comfortable and stylish chairs, passed away at the age of 91.Mr. Kukkapuro designed a variety of furnishings, but was best known for his seating, with his chairs being widely used in public spaces in Finland.He was an experimental modernist, using materials like fiberglass and other plastics, as well as organic materials like plywood and leather.One of his most famous designs was Karuselli, a sleek lounge chair that could both swivel and rock.