Post-painterly abstractionists differed from abstract expressionists in their

answer: the feeling it gives you when you look at it.

explanation:

in every single medium of art, you are supposed to feel something that makes it art. like how a song can make you cry, or how a photograph can make you nostalgic. art is very important for expressing yourself as well, when you are happy, sad, depressed, or angry.

we could tell by the rotten smell, that something putrid was in our trash can.