Optical Illusions reveal how the mind processes time and space, and they illustrate the ways that our minds make assumptions about the world around us...and how these assumption are often untrue.

The first form of primitive optical illusions can be traced back to the Ancient Greeks and Aristotle, who pioneered the "Waterfall Illusion." However, the field of optical illusions really only began to gain real traction in the nineteenth century, with the advent of common, primitive illusions such as The Ebbinghaus Illusion and The Muller-Lyer Illusion, for example.

In the twentieth century, competition developed between scientists and artists surrounding optical illusions, and that's when things really took off.

Scientists David Hubel and Torsten Wiesel won a Nobel Prize in nineteen eighty-one for their work related to the field of perception. In the nineteen sixties and seventies an artistic style, called "Optical Art," developed under the mastery of Victor Vasarely. And moving on into the twenty-first century, we saw the resurgence in optical illusion research within theoretical neurobiology, and a whole host of "classic-coffee-table-illusions" developed. The most famous of these were The Hering IIlusion, The Necker Cube Illusion, and The Hermann Grid Illusion.

In the end, our brains take shortcuts, and they choose the most likely interpretation of what it thinks our eyes are seeing at the time. This happens for a number of reasons. For example, colour enables us to differentiate between objects, and also see a greater number of objects. This is an adaptation that evolved to assist with our survival. Our brains are used to a world of color. So when color is removed, we have a hard time interpreting what is going on.

To get more information related to how optical illusions work, check out this awesome article. Or, you can see the unique ways that your brain interprets information with these optical illusions.

Which way is she turning? Right or Left?

Image credit: Geek.com

Thanks to some fancy eye-tricks, the girl can appear to turn to the right or left. This happens because there is no frame of reference i.e., there are no background objects that we can use in order to make a sound determination.

What Color is the Eye on the Left?

Image credit: Michael Bach

If you just glance at this image for a brief moment, the eye on the left will appear blue, while the eye on the right looks gray. In truth, both eyes are the same color. Once again, we perceive color this way because of the lack of information, and the specific colors that are utilized add to the illusion.

Are These Faces Deformed?

The key to this trick is the centering of the eyes. If you look at either the right or left side, you will notice that all of the eyes are in the exact same location. Since the faces move, but the eyes do not, our brains have trouble keeping up with the changes unless we are focusing in on the image itself.

Which Man is the Smallest?

Image credit: NIHES

Our brains are used to an orderly world, where things that are close to us are larger and things that are farther away are smaller. In the above image, it looks like the scene is moving off into the distance. As a result, the last man should be farther away and, thus, a giant when compared to the other men. However, in reality, all of the men are the same size.

How Much is the Image Moving?

Image credit: CapitaloGix

It isn't moving at all. However, because of the way that the colors are twisted together (and the way that the columns grow and shrink in thickness), it looks as though the image is moving about and the colors are spiraling down.

Which Box is Darker?

Image credit: WikiMedia

In this image, we see the two different colors because of the reflective white line in the middle. Or rather, we think that it is a reflective white line, and we assume that light is coming from above. This alters how we see the color of the two objects in the picture (our brains interpret the information differently based on where we think the light source is).

Find the Dot

Image credit: AllKids

The Darkness Grows

Image credit: SlowDive

Stare at the center of the image, and watch the darkness grow. Well, not really. It stays the same size; however, we aren't focusing on the lines, so they being to blend together because they are spaced so closely next to one another.

Speak the Name of the Color, not the Word

In this case, there is a disconnect between the color that our eyes see and the way that our brain is reading the various words. We can't really help how the process unfolds. Our eyes see the word, and our brain pieces the letters together to tell us what the meaning is. This processing makes it harder to just say the color, as it is difficult to force our brains to focus on just that one task (just saying the name of the color).

Which Face is Angry?

Image credit: GoodTricks

The image on the left looks angry. Squint, and the image on the right does. This has to do with light and shade and a lack of color. When certain cues are missing, and when we aren't focusing fully, it is difficult to discern what is going on.

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