Robert Allison's SAS/Graph Examples
Illusions, Puzzles, and Fun!
Click on thumbnail to see full-size chart.
Click on label to see descriptions and SAS code.
Koffka Rings Illusion
Psychedelic Message
Hidden Numbers
Tricky Color Poster
See The Hidden Photo
How Many Squares?
Illusion of Circles
Twelve Dots Illusion
These samples courtesy of Robert Allison
Please see the following README