This optical illusion is called "True Cyan." By focusing on the white dot within the red circle for an extended period of time, it allows you to see a blue otherwise unachievable on a normal tv or computer screen. This inability due to the heavy dilution from color pollution.
If you stare at the circle's core long enough (the longer the better) and stay focused on the white dot you will start seeing a rim of light around the red circle. After a minute or so, feel free to pull your head back slowly while continuing to focus on the white point. The rim will appear to grow in size and will show you the most incredible blue: True Cyan!
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