I guess I've watched this over 7 or 8 times - maybe more. I've already given my thoughts on it before but I'm still wowed by it and I couldn't tell you why. There's just something so precisely mathematical about everything in this film that appeals. The austere beauty of Easter Island itself. It fits the timeframe of films of well-off hippies go off on an exotic journey and find themselves but messing around with it slightly (throw a sci-fi angle in and add in some politics).
This film isn't for everybody but for those that love it - savour it!