Navy, as a controlled feature wall, provides depth. Light grey on the other walls keeps the room balanced and readable. A leather sofa grounds the scheme with durable texture. A metal floor lamp adds a slender line and focused light. Use matte on the navy to reduce shine. Keep trims and ceiling in soft white for clarity. Cushions in grey and tan link the sofa and the walls. A simple wool rug prevents echo. Limit decor to a few considered pieces. Wipe leather and lamp surfaces regularly to maintain the clean, minimal look.