There is a version of art collecting that is really just shopping for signatures. It reads the label first and the canvas second, buys the name the market has already agreed on, and calls the receipt a collection. It is the safest way to spend a great deal of money and the surest way to end up with a wall that says nothing about the person standing in front of it.

The alternative is older and harder: buy the eye. Buy the work that stops you, that you would want to live with whether or not anyone else had heard of the hand that made it. The signature is the easiest thing to pay for. The eye is the thing worth developing, and it is the only part of collecting that cannot be bought outright.

The name is a shortcut, and shortcuts are priced in

A famous signature is a market consensus, and consensus is expensive precisely because it removes the need to look. You are paying other people to have decided for you. Sometimes they were right. Often they were early, and the price now reflects the certainty rather than the picture. Either way, you have outsourced the one judgement that makes a collector a collector.

This is the same lesson the saleroom teaches in every category we cover: worth and price are different animals, and the gap between them is where attention pays. In art the gap is widest, because so much of the price is reputation and so little of it is paint.

How to look before you buy

Stand with the work longer than is comfortable. The pictures worth owning reveal themselves slowly, and the ones that do all their talking in the first ten seconds tend to have nothing left to say by the time they are over your sofa. Ask what the hand actually did, where the difficulty was, whether the thing is made or merely arranged.

Then check the dull facts, exactly as you would a car or a watch. Provenance: where has it been, and is the chain unbroken. Condition: what has been restored, relined, repainted, and was it disclosed. Authenticity: who says it is what it says, and would they stake their name on it in writing. A beautiful picture with a thin file is a problem wearing good clothes.

A collection is a self-portrait

The collections worth visiting are never lists of the obvious. They are arguments, made in pictures, by someone who trusted their own eye enough to be occasionally unfashionable. They contain the famous name bought early and the unknown hand bought on conviction, and the second is usually the one the owner talks about first.

Buy the eye, then, and keep buying it. The names will look after themselves, or they will not, and it will matter less than you think. What hangs on the wall, in the end, is not a portfolio of signatures. It is a portrait of how you see.