Science Fair Central A good place to start a project. Includes handbook, project ideas, links and books.  Visual Perception Peter K.Kaiser, York ...

Can Bryce 3D make illusions? Yes it can. Bryce is just my cup of tea when it comes to rendering optical illusions. It is inexpensive, and best of all it loves ...

Here are two verticle lines of identical length. One has reversed arrowheads while the other's look normal. One of the lines looks longer! Something about ...

Top Hat Illusion Did you know that there is a famous illusion associated with Lincoln's hat? Consider the size of this president's stove pipe hat. Namely ...

A familiar checkerboard pattern. The rows and columns are neatly aligned and square. Watch the pattern bend when you move either slider bar! Note: The ...

The Hidden Dog Illusion The art of blending into a background. This demonstration illustrates the basic principle of Camouflage. There is a cute dog hidden ...

This popular comic strip had two different stories running at the same time. You could follow a second story by turning the cartoon upside down. In this ...

There are two competing aspects in this illustration. One is the obvious shape of a goblet. The other, more subtle aspect, consists of two opposing faces ...

Teachers, schools, students, classrooms, and education professionals around the world show off their websites. Add your link today! Grades K1 - 8 ...

A 2009 Engagement Calendar for the Visually Intrigued Since the Renaissance, artists have relied on rigorous laws of perspective to produce orderly, ...

Circular Pattern I A moiré pattern is the combination of two or more patterns viewed at the same time. This example will produce a weird moiré of ...

Shepard's Scale  Like the endless staircase, these twelve musical notes go up or down forever. It's impossible! Pass your mouse over the dots one at ...