Full Idea
Reality in a world, like realism in a picture, is largely a matter of habit.
Gist of Idea
Reality is largely a matter of habit
Source
Nelson Goodman (Ways of Worldmaking [1978], 1.6)
Book Reference
Goodman,Nelson: 'Ways of Worldmaking' [Hackett 1984], p.20
A Reaction
I'm a robust realist, me, but I sort of see what he means. We become steeped in unspoken conventions about how we take our world to be, and filter out anything that conflicts with it.