Diane Keaton's living room is proof that 'symmetry in interior design' is far from dated – this concept is still ingrained in our philosophy, but there's a twist

The idea of symmetry as a harmonizing force has been ingrained in the minds of architects and designers for millennia. Balance around a central point is agreeable to the eye and creates a calming atmosphere.

This modern farmhouse living room scheme, designed by Stephen Shadley for American actress Diane Keaton, has a soothing cream and brown palette, with perfectly pleasing symmetry.

'However, symmetry in interior design isn't just about balance,' says designer and decorator Joanna Wood. 'Something as simple as two wall lights on either side of a fireplace forces the eye to scan the whole area, creating the illusion of extended space.'

Objects don't have to be identical. Create a looser effect by pairing items of a similar height or tone. A cohesive color scheme will help to anchor your arrangement in place.

Symmetry has intense psychological benefits too, says designer Nina Lichtenstein. 'In interior design, achieving symmetry and balance is a cornerstone for creating harmonious and visually appealing spaces. 'Symmetry, the mirror-like reflection of design elements, is a powerful tool that instills a sense of order and tranquillity in any room.'

The best way to use symmetry in a room is by having an architectural feature as a starting or center point. The fire surround and identical glass-fronted doors were the jump-off point. If you don't have a defining architectural feature, you can use furniture to create a symmetrical look.

Mastering the art of good furniture placement will ensure that your home is practical and sociable, no matter the size or layout. It all comes down to size, placement, and symmetrical styling.

'When planning a failsafe living room, the number one rule before even considering anything decorative is to prioritize functionality first,' explains New York-based designer Kati Curtis. 'The living room is often the most utilized space in a home and often must be multifunctional. Serving as a hub for social gatherings, relaxation, and more recently, even work.'

It is crucial to only select living room seating that is in proportion to the size of your room – oversized sofas and armchairs can make a small room feel narrow and claustrophobic.

Diane Keaton's California home is a perfect example of home life in good symmetry. Placing two sofas opposite each other does more than just emphasize its symmetrical layout; it is conversational. The doubling-up technique of furniture and accessories creates a wonderfully balanced space and is a strategy that stands the test of time.

Follow in Stephen Shadley's lead and trick the eye by employing a touch of 'asymmetry' into the space. Asymmetry is something I always think about – balancing and counterbalancing height and structure. It is an interior design trick of the trade to add further depth and interest.

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