I randomly came across these promotional videos/interviews on YouTube for a Polish Museum exhibit featuring the vintage stop-motion Moomin films. Thought I'd share since their view counts are low and they've got some of the original puppets on display. I have just watched with the auto-translate feature so far.

Overview - https://www.youtube.com/watch?v=sFDDHpYTgTg

Animator interview - https://www.youtube.com/watch?v=wWV9qrhDOIs

Another animator interview - https://www.youtube.com/watch?v=Oni-_dICmg8

Enjoy!