A set of four different couch designs are shown in a technical drawing style, with measurements and dimensions indicated. The couches vary in size and style, with the first one being the largest and the fourth one being the smallest. Each couch has a unique design, with the first one having a more traditional look, the second one featuring a modern design with a low back, the third one having a high back with a more classic design, and the fourth one being a minimalist design with a low back.