• App users click here to take the test
When you look at this red dot, what do you see? If your eyesight is good enough you'll note a picture hidden inside the circle.
The brain teaser purportedly tests the viewer's vision, with people claiming to see everything from a slim outline to a detailed picture.
Currently trending online, many viewers report being baffled by what the image actually shows.
Given the option to flip the image, the overturned dot reveals a detailed sketch of a horse with a mane, tail, saddle and bridle.
