Checkerboard Twisted Cord Illusion

Estimation 30 November 2012 0 Comments

Checkerboard Twisted Cord Optical Illusion

All of the edges in this image are straight and either horizontal, vertical, or at a 45° angle.  Does it appear that way to you? Edit:  I just also noticed that if you move your scroll bar up and down when viewing this image it appears to have some motion elements to it.

Fraser Spiral Illusion

Estimation 22 March 2012 0 Comments

Fraser Spiral

Do you see a spiral in the image below? There is no spiral.  This drawing consists of a series of concentric circles.  This illusion, called the Fraser spiral was discovered by British psychologist James Fraser in the early 20th century.