A tree’s name can turn a familiar shape into something you begin noticing elsewhere.

Learning a name changes what your eye can find. Before you learn it, a tree is scenery. Afterwards you see the same species on your street, in a car park, outside the office, as though they had arrived overnight. The world did not change, your filter did; attention is trained by vocabulary far more than most people expect.

Learn the name of one thing you pass regularly, a tree, a bird, a style of window. Then count how many you spot over the next fortnight and notice how the walk changes.