After years of development, Knoll introduces the Petitt Seating Collection by Don Pettit. Also known as the 1100 Series, the final product is a triumph of engineering that takes bentwood furniture to the next level of innovation and informs many future Knoll designs.After years of development, Knoll introduces the Petitt Seating Collection by Don Pettit. Also known as the 1100 Series, the final product is a triumph of engineering that takes bentwood furniture to the next level of innovation and informs many future Knoll designs.