A serious question: Why is this not a poem?

a cow
chews grass
in vermont

Is what we're working with, right? Well let's use this as an example, let's try adding and/or take things away from this simple sentence and see if we can turn it into a poem.

cow

chews

grass 

Vermont 

would that be a poem?

What if I took the original piece and spoke it in a odd manner, where I stress certain words and not others. would that make it a poem? would it change the meaning even if I didn't change the words?