There are 16 circles in this image. Can you see them all?

Are you a fan of optical illusions? The last of these images to go viral around the world is the one you can check out in more detail below, which consists of a series of horizontal and vertical lines in shades of white, black and gray that form an interesting design. See below:

However, did you notice that in the illustration above - whose geometric lines form a series of 20 rectangles - there are also circles? No less than 16 of them in total. All situated in full view. Not? So, get back in the image and look again more closely.

According to the folks at Twisted Sifter, the illustration was shared by a Reddit user recently, and according to the discussion going on, not everyone can see the circles. If you include yourself in this gang - which can't see the spheres - don't worry. You can see the following glue:

Tell the truth! Now you can not "unravel" the circles, right? And how do these crazy optical illusions work? According to James Gould-Bourn of Bored Panda, in general, this kind of illustration is based on the use of patterns, colors and shades, and the "magic" happens because our brain, trying to interpret what we are seeing, It ends up creating a perception that does not match the image that is before our eyes. But tell me, dear reader, could you see the circles without the glue?