20 Amazing Clear Water Pictures at the Beach and the Mountains. An interesting phenomenon is the illusion that boats and people appear to be floating in air when they are actually floating in crystal clear water. The shadow of the boat is on the bottom of the lake or ocean rather than on the water so the object (boat or person on a float) appear to be floating on air rather than clear water. It is a cool optical illusion you can see in the some of the photos below.
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