A moiré pattern is the combination of two or more patterns viewed at the same time. This example will produce a weird moiré of rotating, parallel lines. To produce the moiré drag the top pattern slightly with your mouse. Note:  A slight movement makes a big difference.

Build an Impossible Triangle and discover the Ames Transformation! The plan is a full-color PDF formated page which requires Acrobat Reader 3.0 or later to view.  If you have Acrobat installed, click on the file name. If you don't have it you can get it free.

Follow the steps in either direction.  They go on forever no matter which way you go. These steps are musical steps.  Mouse-over to hear an idividual note, or mouse the buttons to play a simple repeating song with 12 notes; one for each step.  Listen to the musical notes, and play the song in both ...

Impossible Columns How many round columns do you see in this figure? How many columns? The geometry shown is quite impossible, yet the entire structure is real and three dimensional. The photograph required no retouching. How did they do that? This amazing model was built by best selling ...

Are all the gray squares in the checker board the same shade? Yes. If you don't believe it drag the pill-shaped swatch over the squares to see if they really match. Now drag the circular lens onto the checker board. The circular lens makes the colors below appear darker. Center the circular lens ...

Only the negative parts of the letters which make a famous persons name are shown in this puzzle. The trick is to re-assemble the pieces and reveal the hidden name. Use the red box as a guide. When assembled correctly, the pieces will all fit into the box and spell out the mystery name. Try ...

Most of us have handled a standard deck of playing cards at one time or another. The basic card designs with which we are all familiar have remained unchanged for hundreds of years. Do you think you could spot an error? This special deck cards has a twist. Each card is wrong in one, or more ...

Here is a game that will attempt to read your thoughts. Keep one hand on the mouse at all times (just kidding). Wait for the first instruction then follow along carefully, clicking NEXT after each step. Be honest and try not to cheat! You just might be rewarded with a surprise at the end.

Painting Hint The Hidden Tiger ... Look at the Tiger closely and take the title "literally." Dream ... You are looking for an conveyance that isn't really there. Ten Friends ... The missing "friend" is a quadruped. Deer ... Look at the branches above the ...

  Painting Answer The Hidden Tiger ... The Tiger's stripes spell out the title of the painting. Dream ... The outline of the barn door, an old tire, some chicken wire, and other items make the shape of an old jalopy.  Ten Friends ... The missing "friend" ...

To a lover of illusions, D. L. "Rusty" Rust is a champion. Wildlife artist Rusty Rust is a premiere American painter and producer of a rich variety of realistic natural and portrait art. His wonderful technique and style add up to an obvious love of subject. He now captures the ...

Sandro del Prete, a Swiss artist, began his career in 1981. After studying art and technique in Italy, Prete returned to Switzerland, where he continues to experiment with human perception and illusion. His passion for the subject is reflected in the breadth of his life's work. Prete imbibes a ...