The spinning spiral - a frightening optical illusion!

Download the program spiral.exe (only 22 kB) and then:

1. Run the program from its current location.

2. If asked, click Yes to install it.  Keep your hand on the mouse.

3. While the program is running, focus your eyes on the central point of the spiral for 30 seconds.

4. Look to the hand that is on the mouse. 

5. Don't scream.

(© Troy Zerr)

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