7 optical illusions  tricks that occur naturally

Everyone enjoys an optical illusion, and we encounter them frequently in the natural world, even if they completely stump us.

That is not what this "underwater waterfall" appears to be.

Similar to this, the well-known Jacob's Well in Texas appears to be thousands of feet deep, but it is actually an illusion.

At a certain time of year, Yosemite's Horsetail Fall appears to be on fire.

This enormous shadowy figure is an optical phenomenon that happens naturally.

This Bolivian salt flat is ideal for making shadow plays.

This sky appears to be ocean waves, but it's actually a unique type of cloud.

These aren't UFOs; these are clouds.

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