CLEAN : Pissarro, Richter and other masterworks up

The video discusses upcoming major art sales at Sotheby's in London, highlighting significant works like Pisaro's street scene and a Van Gogh painting. The Van Gogh piece, off the market for 25 years, gains attention as the National Gallery exhibits his sunflowers. The video also covers the importance of color themes in the auction, featuring works by Richter, Warhol, and Burri.

Who is the artist mentioned in the text that is associated with the key abstract paintings?

What are some of the highlights of the sale mentioned in the text?