The house said the "visionary" Weinbergs "assembled one of Europe's most distinguished collections over the past 50 years." ...

Triangle Belt Piece is a perfect example of "Abstraction ... have continued to explore nonrepresentational art in the decades following abstract expressionism's mid-century heyday.

The word painting can also be used as a noun to talk about the piece of art painted by the artist, e.g. The painting was hanging in a gallery. So, expressionism is painting to show how you feel ...