In my first Instructable I will be showing you how to make a star or cross optical illusion.

Step 1: Materials

-Ruler-\$0.99
-Markers(Or any other color tool).\$3 I find markers look better.
-Paper-Varies
-Pencil-\$0.99
-A good eraser-\$1.50
-Patience and time.- Priceless.

Step 2: Decide Whether to Do a Star or Cross.

The cross requires to do only two axes therefore less time and the star requires 4 axes and more time.

Step 3: Cross Set UpUp Instructions.

Draw a vertical line. Make it about 17 centimeters long, and make a mark every centimeter. Then make a horizontal line through the middle of the vertical line you just drew. It needs to be 17 cm with a mark every centimeter.

Step 4: Star Set Up.

You will be making a cross as described above. Then you will add two diagonal lines of the same 17 cm with markings at every centimeter. You will end up with something similar to the photo above.

Step 5: Let's Draw!

I have numbered two of the pictures above to help explain this process. You are going to draw a line from 1 to 8. There are pictures above for these steps. Then you will draw a line from 2 to 7, 3 to 6, 4 to 5, and so on. Once you finish a section, you move to the next and repeat.

Step 6: Color.

Pick any color and color in a alternating pattern.

Here are the finished products and one that I did a long time ago.
Oops. Thank you. When I was taught to make it, I was told that the illusion is made because of the curved appearence, when it is all straight lines.
Not sure how it's an optical illusion but it definitely looks pretty cool. BTW, you can tell on the picture on the last step, you missed coloring in 2 spots. Not that that really matters, just letting you know incase you hate having something unfinished as much as I do,