This is a Wong Kar Wai movie and as such it's incredibly beautifully shot and has some wonderful imagery in it. The whole plot is about two people who move in next door to each other and their spouses start having an affair. After they find out about it, they decide they're not going to be like their spouses, but proceed to fall in love, but can never do anything about it. It's got some really interesting aspects to it because it takes place in the 1960s, but you never actually see the spouses. You might see the back of her head, or his shoes, but you never see them. You only see the two main characters. It moves slowly but smoothly, and it's short enough you don't get impatient for it to end.
Beautiful and simple. Slow but not annoyingly so.