Light colours on peripheral walls

The idea that "white enlarges" and "dark shrinks" is too simplistic. It leads to bland white interiors without character, which are not actually any larger.

The real rule: place light colours on the peripheral walls (those defining the room's limits, seen from the centre), and keep a dark accent zone on a single wall, generally the shortest or the one behind the main piece of furniture.

The eye then perceives the room's limits as distant (thanks to the light shades on the main walls), while keeping an anchor point (the dark accent wall).

This principle combines two perceptual effects. Light colours recede from the gaze (depth effect), dark colours attract the gaze (anchoring effect). Well dosed, the result is a room that appears both larger and more structured.

Identifying the peripheral walls.

These are the walls most visible from the centre of the room. In a rectangular bedroom, they are the two long side walls and the wall with the window. In a living room, they are the main walls that define the space.

Identifying the accent wall.

This will be a single wall, generally the shortest in the room, or the one behind the headboard, the sofa, or the TV. It is the wall that serves as a "focal point" and anchors the eye.

Choosing light shades.

Warm off-white. The most versatile. Farrow & Ball Slipper Satin, or similar warm whites.

Pale sandy beige. Slightly more characterful than off-white, gives personality without reducing the enlargement effect.

Pale pearl grey. For cooler or more contemporary atmospheres.

Pale seafoam or glacier blue. For calm atmospheres, works well in bedrooms.

Choosing the accent shade.

Darker than the peripheral walls, in the same pigment palette. If the walls are warm off-white, the accent can be deep sage green, teal, sustained terracotta, powdery burgundy.

To avoid for the accent: very saturated flashy shades (tomato red, fluorescent yellow, electric pink) that date quickly and do not marry with light neutrals.

Farrow & Ball publishes a complete guide on the "feature wall", systematically recommending keeping three neutral walls and one strong wall. Their classic English combination: three walls in Slipper Satin (warm off-white), one wall in Hague Blue (deep blue).

Joseph Dirand often varies ratios by room. In a bedroom: three off-white walls and one taupe wall. In a living room: sometimes two light and two dark walls (50/50), but only in very large rooms.

Pierre Yovanovitch works almost exclusively with four light walls, with a single dark element that is not a wall but a piece of furniture (dark navy sofa, burnt orange armchair). The enlargement logic is the same.