Giving depth to a surface is the challenge that often arises when choosing a wallpaper. The wallpapers we have selected aim to cover the walls while creating the illusion of a larger space. Using geometry means opting for a timeless and contemporary feel. Composed of squares, triangles, graphic or holographic, three-dimensional effects create a flattering illusion of size. Cole and Son and Ferm Living are two of the wallpaper brands that achieve these goals very cleverly.