Tension between what?
Legitimate question.
Tension, like war, entails opposing things or forces. If you see tension, you see tension between two things, so you already see two, in tension with each other. So the answer to “tension between what?” depends on what tension, or whatever thing, you are observing.
Any individual thing is a tension, arising at the boundary between the nature of the thing, and everything else, or the nature of the thing, and it’s becoming.
This is all basically what I’m talking about in the “what is a thing” thread.