Realist and dreamers.

"There are dreamers and there are realists in this world. You think the dreamer would find the dreamer, and the realist would find the realist, but more often then not, the opposite is true. You see, the dreamers need the realists to keep them from soaring too close to the sun and the realists, well without the dreamers, they might not ever get off the ground." - season 3, episode 9, Modern Family.