The Selfish Giant

(from Wikipedia)
The Selfish Giant is an animated short film adaptation of the short story by Oscar Wilde. The story has symbolic religious themes and may be considered a work of allegory in Christian literature. The film was produced in 1971 by the Canadian-based Potterton Productions and by Pyramid Films. It earned a 44th Academy Award nomination in the animated Short Subject category. 

A giant erects a wall to keep children out of his garden, reaping the consequences of a continuous winter. After months of winter with no other seasons in sight, spring suddenly returns when the children slip into a hole in the wall and play in the trees, except for one corner of winter where a little boy is too small to climb into the tree...