Flip flopping Images by BC
Science Behind the Illusion
This looks like 2 things - a waterfall AND people walking down a hill. This works because when you look at the top of the image, it appears to be water falling down. As your eyes move down the image, the water turns into people. This works because our brain see something at first, and then makes sense of what it is seeing by changing it to something else that makes sense. They look like people, right? Scroll up and check it out for yourself!!
"Optical Illusions !!" Optical Illusions. N.p., n.d. Web. 18 Mar. 2015.