Almost every piece that does not work in a room failed on a number, not on taste. It was too short for the surface, too tall for the shelf, or the right size for a showroom and the wrong size for a hallway.
These are the measurements worth knowing before you buy anything.
Table lamps: 55 to 70 cm
A table lamp has one job, which is to put light at roughly the height of a seated person's shoulder. Below about 55 cm it lights the table and nothing else. Above about 70 cm on a normal side table, you see the bulb from the sofa.
The Tripod Table Lamp is 65 cm, which lands in the middle of that window, and 35 cm across, which is the other number people forget. A lamp wider than about half the surface it stands on will always look crowded.
Console arrangements: nothing taller than 45 cm
A console is seen standing up, at eye level, usually against a wall. Anything over about 45 cm starts competing with whatever hangs above it. Anything under 20 cm disappears from two metres away, which is the distance most people actually see it from.
Coffee tables: under 30 cm
The constraint here is sightlines. Two people sitting opposite each other should be able to see each other's faces. That puts the ceiling around 30 cm, and lower is usually better.
Wall art: lower than instinct says
The centre of a piece should sit around 145 to 150 cm from the floor, which is average eye level. Most people hang art ten to fifteen centimetres too high. Above a console, use the gap instead: 20 to 25 cm between the top of the furniture and the bottom of the frame reads as one composition.
The rule that covers the rest
Two thirds. A piece on a surface should occupy about two thirds of its width, or group with others to that total. Less looks lost. More looks stacked.
None of this replaces judgement, and a piece you love at the wrong size is still better than a piece you tolerate at the right one. But measure first. It is much cheaper than returning.
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