Kubrick's Triangle

I haven't seen this analysis very many places so I'd like to share it.

Kubrick's three films Doctor Strangelove, 2001, and A Clockwork Orange all connect with their beginnings and ends. Doctor Stranglove ends with the song We'll Meet Again. Some lyrics at the end of the video read "And I'll know we'll meet again some sunny day". 2001 begins with some planets and the sun. 2001 ends with the baby looking at the camera and ACO begins with Alex looking at the camera. ACO ends with Alex and a women having sex and Doctor Strangelove begins with the refueling of a plane.

It is very interesting that they connect like this. Does anybody have a theory on what it means?