I'd appreciate any help identifying this old animated film.
The main trope is that people have a shoe-print in the backs of their heads. The young wear a training mold on their heads to form the shoe-print, which they need in order to "fit" properly into society. The tired breadwinner of the household has his shoe-print massaged at the end of the day by his sympathetic wife. The son of the family has his shoe-print mold removed when he finally enters society.
This film was from Russia or Poland, I think — a Soviet-bloc country, in any case. I saw it around 1978. I remember the colors being mostly greys and generally drab, and there were no words or names that I can recall.