Size is decided on the wall
The common mistake is choosing the work first and discovering later that it reads as a postage stamp on the wall. Format is not a property of the work: it is a relationship between the work, the wall, and the distance you look from.
The two-thirds rule
Above a piece of furniture — sofa, console, sideboard, headboard — the work or group should occupy roughly two thirds of the furniture's width. Narrower and it looks lost; wider and it crushes the furniture.
Height is measured from the eye
The centre of the work sits about 145-150 cm from the floor: average standing eye level, and the reason museums hang everything at the same height. Above a sofa, though, the distance from the back wins: leave 20-30 cm between the top of the furniture and the bottom edge of the work, or the two read as a single object.
Viewing distance changes everything
A corridor is seen from a metre away: a 45 × 30 cm format is perfect there, and a large one cannot even be taken in. A living room is seen from three or four metres, and there a small format belongs in a group, not alone.
One large piece or several small ones
Two different choices, not interchangeable. A single large piece brings calm and works on walls already crowded with furniture. A group of equal formats brings rhythm, but demands rigour: same gap between pieces, alignment on one axis, ideally the same format. Mixed formats in a group only work if a strong axis holds them together.
The formats we carry
The catalogue works in 2 formats: 45 × 30 cm and 60 × 40 cm. They are deliberately manageable sizes — they take standard frames, they ship in a tube without risk, and they hold up both alone in a small space and in a group on a wide wall.
Test before you drill
Cut a sheet of paper to the exact size and tape it to the wall with masking tape. Leave it two days. It is the crudest and most reliable method there is, and it costs nothing.