One of the more interesting features at the 12th Istanbul Biennial is Matt Collishaw's photograph entitled "Bullet Hole". Taken from a pathology textbook, Bullet Hole features what appears to be a bullet hole in a human scalp. The photograph is displayed on fifteen lightboxes and creates quite an impact.

Corban Walker's work at the Venice Biennale 2011 consisted of 176 stainless steel cubes arranged in various configurations. He is obsessed with grids and rectangular patterns, frequently using glass as his medium. This is a talented voice.

The Metropolitan Museum of Art is featuring an exhibition titled "The Andean Tunic, 400 BCE-1800 CE". Lovers of pattern, textiles and ancient history will delight in this intelligent showing of these fabrics, some of which look like contemporary designs.

Those of you interested in contemporary Chinese photography might want to check out an exhibition called "Three Begets Ten Thousand Things" at the Blindspot Gallery. Featured are two prominent Chinese photographers, RongRong and inri.

Toomey Tourell Gallery in San Francisco is showing the work of Jimi Gleason. Gleason uses silver deposits and acrylic on canvas to produce some unusual pieces.

The Museum of Modern Art has mounted a retrospective of the paintings of Wilhelm De Kooning. Centering on De Kooning's women, the exhibition was prepared by John Elderfield and is considered the first "blockbuster" show of the season.

By now you are probably familiar with the excellent TED talks available for free on the Internet. One of the better ones recently posted is by Kevin Slavin entitled "How Algorithms shape our world". Slater argues that we are creating algorithms that we really don't understand and clearly don't know how to control. This applies to complex projects like stock market values, architecture, and espionage. Prepare to be fascinated.

The Henry Moore Foundation is the source for an exhibition of Moore's Plasters, some of which are being shown for the first time. Four years in preparation, the show gives a sense of how the preparatory sculptures led to the final pieces. An extensive book accompanies the show and is available for purchase. Additional insight may be found in an article from the Financial Times called "The Man Behind the Monuments".

You won't want to miss this incredible story of a chiropractor turned artist after a severe stroke. John Sarkin has literally lived two lives. His remarkable story is also available in a new book called "Shadows Bright as Glass".