Lee Ufan's work is an acquired taste. He's intriguing and little by little you find yourself drawn to his oeuvre. There's something mesmerizing and haunting about this particular piece - paint and brush strokes for their own sake - but very well done.
He currently has a show at Blum & Poe Gallery.
Looking through 4 or 5 pages of Google Images will give you a fuller picture of his work.
The image is from Fre llgen's Web Album where you'll find many more interesting images by many other artists.