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 ...

Today’s challenging puzzle is a scenery image of a waterfall with a cleverly designed optical illusion image. At first glance, this waterfall appears normal, but in this waterfall, there are ...

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.

What appeared to be a waterfall flowing in the opposite direction was not an optical illusion. "Reverse waterfalls" occur in nature when strong winds hit cliffs and drive water upwards ...

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 ...

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 ...