The first time I watched this movie, I was a little bit tired and I fell asleep 20 minutes in, concluding that it was the most boring movie I had ever seen. A few years later, in a more energetic state, I decided to give it a try, this time lowering my expectations and bracing myself for the slow pace. This time, I still found the slow pace bothersome, but I found that the movie was so wonderful in every other aspect that I could look past some of the (excrusiatingly) long sequences and enjoy the masterful visuals, music, tension, and mystery that Kubrick assembled. Honestly, this might be the most beautiful film ever made. Every shot looks like it could be an award-winning photograph. Technically, it appears superior to many current films. The movie's ending is highly perplexing, but it didn't bother me too much since it is obviously meant to be pondered by the audience. Overall, it's easy to see why this is considered one of the greatest films ever made and I consider it my favourite of Kubrick's. The only problem I have with it (I say this at the risk of receiving some negative reviews) is the pacing in parts. I feel that 20 minutes or more could be easily shaved off if some of the sequences were shortened slightly. For example, there are numerous times in the movie where we watch a person or object float slowly in space for minutes at a time. While I can appreciate the devotion to realism, I'm still tempted to press the 1.3x feature on my remote for such parts. But overall this is a fantastic work of science fiction and shouldn't be passed by simply because it is slow.