1. Stare at the red dot on the image below for 15 seconds
2. Glance over to a blank surface (a nice white wall ideally)
3. Blink like your life depends upon it.
FYI: I stumbled across this excellent optical illusion over on the Quipsologies blog.

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Samuel Cane
Digital Designer and planner, ex Butcher and fishmonger, proper code zealot, built this site
27
January 2012