Autostereograms are optical illusions of depth that are designed to trick the brain into perceiving a three-dimensional scene in a two-dimensional image. The simplest type, known as a wallpaper autostereogram, consists of horizontally repeating patterns that appear to float in the air above the background. In order to perceive the 3D shapes, the brain must overcome the normally automatic coordination between focusing and convergence. What are the two ways that an autostereogram can be viewed?
Eleanor H. Porter
Back in the day
Prince Andrew is the third child and second son of Queen Elizabeth II. He has held the title of Duke of York since his marriage to Sarah Ferguson in 1986. Initially, the Duke and Duchess appeared to have a happy marriage, but problems soon surfaced, and the marriage collapsed shortly after tabloid pictures were released showing the Duchess cavorting with her financial advisor. Where does Prince Andrew sit in the line of succession to the British throne?
Born on a day like today
Chandler was an American novelist whose writings in the 1930s, 40s, and 50s had an immense impact on the crime thriller genre as well as film noir. His well-plotted and brutally realistic novels, including The Big Sleep, feature Philip Marlowe, a hard-boiled yet honorable private detective who became the prototype for the tough-guy private eye of many subsequent American detective novels. Before beginning his writing career, Chandler held an executive position in what industry?