With a cubist cityscape, scale decides whether the study wakes up. Go too small and the folded rooftops turn into a smudge; go bigger and the whole wall gets structure. The greys here do something useful in a room: they cool down warm timber, sharpen off-white paint and make a plain wall look considered rather than bare. Hang it at eye level on a chimney breast, above a desk, or in a hallway where you pass it close. Pair it with grey wool, dark wood, black metal and pale stone. Keep the surrounding surfaces quiet busy patterned wallpaper or heavy florals fight the hard edges and flatten the whole thing. On premium fine-art paper the soft tonal shifts between each grey plane stay readable.