Examples of realistic level art...

Many police shows on TV are pitched predominately on the realistic level.  NYPD fits this category most of the time.  And often episodes of the soaps are on the realistic level.  Remember, this is  the level where everyone would have their normal everyday abilities, and no more.  Almost all documentaries are on this level.  Science shows tend to be on this level. 

So far as novels go, a lot depends on how  you read them (much more about this later), but Thomas Hardy's work has characters on the realistic level.  Jane Eyre is realistic, if you can buy the bit about the wife in the attic.  Much of Dickens takes place on the realistic level, even though some of the characters are two-dimensional.  Virginia Woolf's Mrs. Dalloway can be seen as taking place on a realistic plane.  Thackery's Vanity Fair is another good example.

On the realistic level, since everyone has normal everyday abilities, it is difficult to have a real bigger-than-life hero.  I think of Jane Austen's novels, all of them, as firmly situated on the realistic level.  Admirable as Emma is, she's not really of heroic stature.  I love her none the less for that.

Nor would I feel diminished, myself, if I were cold and therefore warmed myself at a fire in a field. Would you?

This is a good place to say that these "levels" are rough concepts.  Don't be too fussy about them, but if somebody says, "Hey, that Crouching Tiger, Hidden Dragon is a stupid movie," figure out what level they are trying to see it on.  "People just don't fly around like that," they say.... and you know they are faulting the film for not staying on the realistic level. But you know there are other levels... read on!