I don't know what to say about the ending- full of weird lights and trippy scenes. There's a baby at the end. The Russians when they first saw the movie felt it was interesting, but not interesting enough to elaborate on what they thought.
I have been looking for this site, which I found on the 'church of Bob' site. This is one persons interpretation of it. Agree with it or not, it does give one pause to think and elaborate. Enjoy.
http://www.modemac.com/2001/
He has a commentary and criticism section which gives other peoples views of it over many years, so check it out.