Now a Crate and Barrel classic, its pure 1960s aesthetic is scaled deep so you can sit firm and upright, but also slouch back in comfort. Sleek, boxy cushions and slim track arms look elegant and polished thanks to its supple, luxurious leather that will develop a beautiful, natural patina over time. Easily create a custom leather sectional for your unique space by joining the left arm corner sofa with companion pieces from the Petrie Leather Sectional Collection. Petrie Leather Midcentury Left Arm Corner Sofa is a Crate and Barrel exclusive.