Sentence meaning is compositional because, to a large extent, it depends on a combination of the meanings of sentence constituents, which implies the concept of semantic structure.

We obtain a true perception of the laughableness of this sort of buffoonery.

There are two large Veluxes in the steeply pitched roof, and a battery of windows is set high into the bare white walls.

Now list to my morning’s romanza, I tell the signs of the Answerer, To the cities and farms I sing as they spread in the sunshine before me.