I'm nervous to start conversations with the idle person next to me, because the person 2 desks over looks like they're concentrating and I don't want to knock t

I'm nervous to start conversations with the idle person next to me, because the person 2 desks over looks like they're concentrating and I don't want to knock them out of flow. What happens in our open office which is half engineering is that nobody says much of anything. It doesn't help collaberation. If we had cubes or god forbid OFFICES with CLOSABLE DOORS we could have 1-1 conversations whenever we like.