On the surface, Milton's Secret (2016) is a story about a financially-stressed family getting a visit from grandpa, who brings something unusual with him (besides his tea). Because Donald Sutherland really liked the character, he agreed to play Grandpa Howard. Grandpa has a secret, which he shares with his grandson, Milton. It fundamentally changes not only him, but also his parents. Howard brings Zen Buddhism and alchemy to his family. That the fictional (narrative) film explains and relates the two and renders both so transparent for the audience says something about the potential of the medium itself to handle abstractions and relate them to life.
The full essay is at "Milton's Secret."