Optical Illusions That will Definitely Confuse your Mind

Lets Start With the Simple One. From lower to Higher Level check how much your Brain Been in Illusions.

1. Observe closely which disc is turning faster ?
I bet u cant reach any solution because both are exactly same and turning at same rate.

2. The illusion of s*x

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In the Illusion, two faces are perceived as male and female. However, both faces are actually versions of the same androgynous face. One face was created by increasing the contrast of the androgynous face, while the other face was created by decreasing the contrast. The face with more contrast is perceived as female, while the face with less contrast is perceived as male. The Illusion of Sex demonstrates that contrast is an important cue for perceiving the sex of a face, with greater contrast appearing feminine, and lesser contrast appearing masculine.

via Russell, R. (2009) A sex difference in facial pigmentation and its exaggeration by cosmetics. Perception, (38)1211-1219.

3. Mask of Love Illusion

The viewer (test person) sees a picture representing a Venetian mask and is asked if he/she notices something special in it. A surprising number don’t notice that the main features of the mask are actually composed of two distinct faces: a man and a woman kissing one another.
Once the viewer discerns two individual faces, his/her brain will ‘flip’ between two possible interpretations of the mask, making the viewer perceive two faces or one face in alternation.
This kind of illusion, where the viewer experiences two equally possible interchangeable stable states in perception, is called “bistable illusion”.

4. The Leaning Tower Illusion

Here is a novel illusion that is as striking as it is simple. The two images of the Leaning Tower of Pisa are identical, yet one has the impression that the tower on the right leans more, as if photographed from a different angle. The reason for this is because the visual system treats the two images as if part of a singlescene. Normally, if two adjacent towers rise at the same angle, their image outlines converge as they recede from view due to perspective, and this is taken into account by the visual system. So when confronted with two towers whose corresponding outlines are parallel, the visual system assumes they must be diverging as they rise from view, and this is what we see. The illusion is not restricted to towers photographed from below, but works well with other scenes, such as railway tracks receding into the distance. What this illusion reveals is less to do with perspective, but how the visual system tends to treat two side-by-side images as if part of the same scene. However hard we try to think of the two photographs of the Leaning Tower as separate, albeit identical images of the same object, our visual system regards them as the ‘Twin Towers of Pisa’, whose perspective can only be interpreted in terms of one tower leaning more than the other.

5. Illusion of Shape

Honestly, It’s a Circle.

The illusion in the figure on the left consists of two sinusoidal gratings at 45° and 135° which combine to form a plaid. The contrast of this plaid is windowed by a perfect circle. Despite this, the percept is far from circular – rather, it appears octagonal with distinct sides. The percept is generated by attraction and repulsion of the circular envelope in the orientation domain by the sinusoidal carrier gratings. It relies upon the sharp transition between Fraser illusion (attraction) and Zöllner illusion (repulsion) at the knee-points of the octagon.
Whilst the illusion is scale-invariant in that it does not change with viewing distance, if the scale of the carrier grating is lowered (Figure on the right) relative to the circle, the percept changes from an octagon to a diamond. This is well-predicted by the variation in the strength of the Fraser and Zöllner illusions as the relative spatial scale of carrier and envelope is varied (Skillen et al. (2002) Vision Research 42, 2447-2455).

6. Dynamic Luminance-Gradient Effect Illusion

For the primary effect, one should sit at a comfortable distance and then move forward toward the center of the figure. An interesting change in apparent brightness and to some degree form will result what may be called a “here comes the sun” effect. By moving back and forth, this apparent change will repeat.

7. Healing Grid Illusion

The image is regular at the center, but the grid pattern is less regular at the peripheral parts of the images (both on the left and right edges). As you stare at the center of the grid for say 20 seconds, the regularity of the grid pattern at the center spreads into the irregular parts in the periphery. This illusion seems to indicate the preference of the visual brain to see regular patterns.

8. Horizontal Line Illusion

This is a classic and it is almost impossible to get perfectly right. Try it multiple times if you wish. That would kind of be like cheating, but if it makes you feel better, go ahead. You are going to do it more than once aren't you?

9. Stripes Illusion

We like it when simple objects are transformed with a little motion. Click the link below, grab the parallel lines, and move them over the background - see what a little movement does to two boring sets of lines.

10. Look at this oddly-coloured flag for 30 seconds. Then look at a wall or sheet of paper. Does it look more familiar now?

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11.  Black and White Seen in color Ilusion

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Concentrate on the black point in the middle of the image and see what happens.

12. Most Mind Confusing Optical Illusion

This silhouette wins the award for coolest thing we've seen all day - and it's not just because the tiny dancer above is in the buff. This is a little test that will tell you whether the left or right hemisphere of your brain is more dominant.

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Concentrate on the woman's movement. If you see her spinning clockwise, that means you're using the right side, or more creative side of your brain. If she appears to be moving counter-clockwise, then that means the left side, or more logical side of your think muscle is superior.