Short fiction can bridge the boundary between fiction and poetry when written with Calvino's skill. You're inspiring me to re-read Invisible Cities - I haven't picked it up since college.
Speaking of which, if you enjoy the short form, you may dig Jorge Luis Borges. I had a professor who was a graduate student under him, and he taught an entire course on post-modernism centered around Borges' work. He doesn't write with quite the poetry of Calvino, but he's an incredible read that goes deep, and along with Calvino, is considered one of the greats of short fiction.