Pas de deux is a 1968 film by Norman McLaren,
Too bad the sound is not so great, but this is definitely a must-see! And if you’re one of those many people that have too little time to watch both parts: Yoda tells you: ‘watch the second part you must’. Otherwise: See these 15 minutes of pure and stunning visual beauty.
We, the Wikipedia say about the title:
In ballet, a pas de deux (French, step/dance for two) is a duet in which ballet dancers perform the dance together. It usually consists of an entrée, adagio, two variations (one for each dancer), and a coda.