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Optical Illusion is always a hit, and I'm always looking for a way to teach it in some way that's not too difficult. I find, that, no matter WHAT...it's always got some level of difficulty. You can even see in this student example that there are some errors, but you can get the general idea.
1. First, start with a 9x9 piece of paper.
2. Create a simple design with shapes. I prefer circles. I like when they go off the paper, too.
3.Use a ruler and make inch marks going down two sides of the paper (must be on the corner, or "L" of paper).
4.Connect the lines to make a grid.
5.Outline with a sharpie over ALL pencil lines (grid and shapes)
6.Pick ONE color of marker.
7.Start in a corner where there is no shape. Go every-other like a checkerboard but don't be limited by the shape of a square. Three of the hints I give are:
1. Go SLOW and THINK first
2. No two colors should be right next to eachother (side to side)
3. Colors should always be corner to corner with eachother
Go ahead...try it...you know you want to :)