Here's a real surprise for me - an animation short by the master himself, Yuri Norstein. He created four ads in 1994 and 1995 for Russian Sugar. This was his first released work since Tale of Tales, and as always it's a sublime work of poetry in motion. It was also awarded the Breakthrough Prize at the Open Russian Festival of Animated Film.
I don't know if anyone is familiar with these ads, but this was the first I've heard of them. Unfortunately, only one ad is available on YouTube. Hopefully, we'll see others. Are there any other Norstein works that I've still yet to discover?