Witold Leszczynski - Zywot Mateusza AKA The Days of Matthew (1968)

This movie is based on what many consider one of the greatest novels ever written, Tarjei Vesaas' The Birds.
As in all Vesaas novels, the story takes place in a rural setting, and the proximity to nature is an obvious factor. Also, the immense psychological depth of the characters is important.
The protagonist is Mateusz, perhaps 35-40 years of age, who lives with his sister Olga. He is, in some way or another, "retarded", but apparently not emotionally so. This story gives a captivating insight into his world.
The pace is quite slow, the black-and-white pictures are beautiful, the focus is on building an atmosphere and developing the characters, and the choice of music is of very good taste.
There's nothing to see here for those who want action or fun. This is a sincere movie which mature viewers may find totally unforgettable.