The Vogel's

Herb and Dorothy Vogel, a librarian and postal worker respectively, are responsible for one of the most outstanding collections of contemporary art ever assembled. Through modest means the duo began purchasing the work of unknown conceptual and minimalist artists. The work had to be cheap and small enough to fit in their small Manhattan apartment.

The plan worked… and soon the Vogel’s were hailed for a certain curatorial genius.

Herb and Dorothy, a documentary directed by Megumi Sasaki, tells their story.
Found here.