While the photograph is authentic, the "underwater waterfall" is the result of an optical illusion. As explained in a CNN Travel story from August 2019, "Sand and silt on the ocean floor run ...

Later coined the "waterfall illusion," scientists are still investigating the properties of motion aftereffects and what they tell us about the visual brain. The motion aftereffect is a clear ...

creating the illusion of a flow of white water. There are actually two 'falls' at Hierve el Agua: the 'cascada chica' (little waterfall) and 'cascada grande' (you guessed it, big waterfall).

The illusion depicts a river flowing through wooded mountains with a waterfall that resembles a young woman. To the left of the waterfall, a wolf can barely be seen disguised as a mountain edge.

A personality test based on viewers' perception of an optical illusion could speak volumes ... the mind-twisting art piece depicts a waterfall flowing through two rocky mountains.

Optical illusion personality tests use visually deceptive images to delve into the deeper recesses of an individual's psyche, revealing hidden aspects of their character based on what they first ...

an effect we now call “motion aftereffect” or the waterfall illusion. Tracking the flow of the water seems to “wear out” certain neurons in the brain as they adapt to the motion.

The video, taken on February 22, shows Yosemite's Horsetail waterfall lit up as if alight with fire, from several angles. This phenomenon is known as "Firefall." The illusion can only be seen from ...