To look at adaptation in this broad-spectrum way, to take it beyond the realm of art into the rest of life, is to see that all the meanings of the word deal with the question of what is essential – in a work adapted to another form, in an individual adapting to a new home, in a society adapting to a new age. What do you preserve? What do you jettison? What is changeable, and where must you draw the line?

The text is human society and the human self, in isolation or in groups, the essence to be preserved is a human essence, and the result is the pluralist, hybridised, mixed-up world in which we all now live.

What are the things we think of as essential in our lives? The answers could be: our children, a daily walk in the park, a good stiff drink, the reading of books, a job, a vacation, a baseball team, a cigarette, or love. And yet life has a way of making us rethink. Our children move away from home, we move away from our favourite park, the doctor forbids us to drink or smoke, we lose our eyesight, we get fired, there’s no time or money to take a vacation, our baseball team sucks, our heart is broken. At such times our picture of the world hangs crookedly on the wall. Then, if we can manage it, we adapt. And what this shows us is that essence is something deeper than any of that, it’s the thing that gets us through.

—Salman Rushdie on adaptation in film and life in The Guardian