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An Interesting Optical Illusion

Playing with optical illusions is a fun diversion for a momentary break from the workday world, especially the simple ones like this example from the Artext Web site.

The rules are as simple as spreading your hand flat on a desk, clicking the link, concentrating your attention at the screen that pops up for at least a minute, then looking at your hand again.

Besides taking a break, illusions are a great way to test your vision periodically.