D + I. Cube Industrial Design. Marc Newson Ltd. Ross Lovegrove. About Ross. We use a range of fine wood working techniques. Mortise and Tenon - the chairmakers joint! A mortise is cut into one part, and a matching tenon is cut onto the other. The joint is slid together with glue for a very strong bond. Additionally many of our mortise and tenon joints are wedged for an additional mechanical lock on the joint.