The Guardian profiles the ongoing dispute over a series of Agnes Martin works excluded from the artist’s catalog raisonné, and the economic motives driving the lawsuits around the pieces.  “Art has become such a commodity, and there’s so much money at stake, that [if] a painting that belongs to you or as a dealer you may have sold is declared essentially worthless, you’ll do anything to turn the decision around,†says art authenticator Richard Polsky.Read more at The Guardian