Tetris is a range of make-it-yourself cardboard furniture, based on a 10cm square grid that anyone can use to create their own unique designs. Discarded boxes – collected from high streets, supermarkets or at home – are flattened, marked out with the Tetris template, and cut to shape using a sharp craft knife or scissors. Alternating the direction of corrugated layers adds strength. PVA glue is ideal for sticking the layers together and adding a protective outer coating. Tetris can be personalised with decorative elements such as paint, stickers or decoupage, or by adding reused wallpaper, wrapping paper, or posters to the side panels.