And if shaking your head really fast is, er, problematic, you can also just look at an angle or move away from the screen until the image appears.
Here's an Instructable on how to make your own head-shaking illusions.
(via r/interestingasfuck)
Shake your head to see this image
These columns are straight (and not moving)
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How to make an impossible two-legged chair
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This image will disappear if you stare at it long enough
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