Anytime there's separatism going on. It happens all the time, because the illusion before us is that we are separate. It gives us this sense of egoic identity, which is lovely in its own way.
One can only display complex information in the mind. Like seeing, movement or flow or alteration of view is more important than the static picture, no matter how lovely.
It is a dear and lovely disposition, and a most valuable one, that can brush away indignities and discourtesies and seek and find the pleasanter features of an experience.
When the first-rate author wants an exquisite heroine or a lovely morning, he finds that all the superlatives have been worn shoddy by his inferiors. It should be a rule that bad writers must start with plain heroines and ordinary mornings, and, if they are able, work up to something better.