Cushions, the odd-number rule

A composition of decorative objects in an odd number is almost always more dynamic than in an even number. This is an ancient principle observed in photography, painting, floral arrangement and interior design. Even numbers evoke frozen symmetry. Odd numbers evoke movement.

For cushions on a sofa: three cushions on a two-seater, five on a three-seater, seven on a large corner sofa. Never two or four, which create a "mirror" effect without rhythm.

Step 1: choose the number by sofa. Under 2 m, three cushions. Between 2 and 2.80 m, five. Over 2.80 m or for a corner, seven.

Step 2: vary the sizes. Three standard sizes to mix. Large (50 × 50 cm or 60 × 60 cm): basic format, placed back against the backrest. Count 2-3. Medium (40 × 40 cm or 45 × 45 cm): placed in front of large ones, as accents. Lumbar (30 × 50 cm rectangular): just one, placed centre or offset, gives the final rhythm.

Step 3: vary materials and colours. Mix at least two materials (linen, velvet, boucle) and two to three colours (all within the room's palette, see rule 01.1). Not all identical (frozen hotel effect), not all different (bric-a-brac effect).

Winning composition for five cushions on a three-seater. Two large off-white linen cushions at the ends, two medium teal velvet cushions in front, one central geometric pattern lumbar cushion. The eye travels naturally across the composition.

In small interiors. On a two-seater, three cushions are enough and do not overload. Avoid putting five cushions on a small sofa, the seating becomes unusable.

For the bed. The same rule applies to headboards: three cushions (on a standard double bed), five (on a king-size), mixing square and lumbar.

Pierre Yovanovitch often works just three cushions, even on large sofas. Pared-back minimalist effect that lets the seat breathe. Requires very high-quality cushions (dense velvet, heavy linen).

India Mahdavi assumes seven to nine cushions on her large sofas, in varied materials and colours. Generous and theatrical effect.

A practical tip: swap cushion covers by season. Natural linen in summer, coloured velvet in winter. The sofa remains identical, the atmosphere changes. Cover brands: Caravane, Maison de Vacances, Bohemia Design.