If only each of those middle fingers realised that there was another middle finger just next to them. If only they could turn around and see the other middle finger right next to them, just on the other hand, their perfect mirror-image, their perfect complement. If only they realised how close their soul-mate was, their loneliness would be at an end.
But they can't see. They'll never know. They don't have eyes. It's a tragedy.