Because--what if that particular goldfinch (and it is very particular) had never been captured or born into captivity, displayed in some household where the painter Fabritius was able to see it? It can never have understood why it was forced to live in such misery: bewildered by noise ( as I imagine), distressed by smoke, barking dogs, cooking smells, teased by drunkards and children, tethered to fly on the shortest of chains. Yet even a child can see its dignity; thimble of bravery, all fluff and brittle bone. Not timid, not even hopeless, but steady and holding its place. Refusing to pull back from the world.