Next week will be the dueling impressionist and modern art auctions at Christies and Sotheby's, but the public gets the best of both worlds, as the works will be displayed in the auction houses this weekend. The big paintings are a van Gogh of Madame Ginoux (estimated to sell for $50 million) and a Blue Period Picasso of Germaine, both at Christie's, and Picasso's portrait of Dora Maar with a black cat at Sotheby's. You can browse the Christie's catalogue, and you'll need to register for Sotheby's, and it's fun to read the catalogue notes - it's a trip through art history.

Viewings at Christie's Impressionist & Modern Art Evening Sale and Day Sale are 10AM-5PM Saturday, 1-5PM on Sunday, 10AM-5PM on Monday, and 10AM-12PM on Tuesday. Viewings at Sotheby's Impressionist & Modern Art Evening Sale are 10AM-5PM Saturday, 1-5PM on Sunday, 10AM-5PM on Monday, 10AM-5PM on Tuesday, and 10AM-12PM on Wednesday.

Also check out Christie's amazing installation of Donald Judd works at 1230 Avenue of the Americas (20th Floor). The NY Times' Roberta Smith called it "the most beautiful survey of Judd's work ever seen in New York."

Picasso's "Tete de femme (Dora Maar)," at Christie's