Solution:

This is one of the classic illusions that has now been taken up by many architects or designers and are used in many shops' or cafeterias' walls. The disorderly black and white squares are responsible for making us perceive that the lines are bent. However they are not. They are all parallel. If you want a proof, you can try measuring with a ruler.

Solution:

This illusion works on our size perception. You will be surprised to know that both the orange circles are exactly same in the sizes. But you might think that the right one is bigger right? Why? This is because we are perceiving the sizes in relation with the surrounding circles. Since the left ones are larger, we perceive that the inner orange circle is smaller than the right one.

Solution:

This illusion is the proof of how smart our brain is. In the first figure, the three circles are cut and placed in a manner that we can easily trace a triangle on the top of them even though it is not there. Similarly in the second figure, we can make out a sphere on which the spikes are grown. It's awesome right?

Solution:

The tricky thing in this illusion is that there is no spiral at all. They are concentric circles. Don't believe us? Try from the last circle. Then slowly move down to the center and you will be flabbergasted. The reason why our mind perceives it as spiral is the triangular stripes background that is merging in the center. Due to their mergence, we perceive even the concentric circles to be merging at the center and thus our brain produces the information of a spiral.

Solution:

When you move your head back and forth, you find the circles rotating in the opposite direction. The reason for motion is the background. Why they are moving in different direction? This is due to the placement of bits that are forming the circles. Look closely, they are placed in opposite directions. This is the reason why they appear to be rotating in different direction.

Solution:

This illusion is also known as the Sander Parallelogram. You might feel that the left blue line is longer than the right one. Go ahead and measure them with a ruler. Surprised right? They both are of same length. However we perceive the left one longer due to the parallelogram figure.

Solution:

In reality the black lines are definitely parallel. But they don't appear so right? The placement of the horizontal blocks over the lines are responsible for the same. Since they are placed in the counter direction alternatively, we perceive that the lines are not parallel.

Solution:

As you scroll the page, you will perceive an effect of rolling waves. The reason behind this is not just one. First, we have alternate placement of two different shades of green. After that, there is the placement of the white and pink flower kind of pattern which plays a major role here. This is why we find the pattern to be rolling in a wave form or at times like hills and valleys.

Solution:

The image is definitely not a 3D image. Just see the size of rectangles and squares used. You can find out that the rectangles or squares are particularly smaller on the edges of what we are perceiving as the swollen square. And inside that square, the squares and rectangles are comparatively quite larger. This is actually the reason why we feel a swollen square in the center.

Solution:

If you scroll the page up and down, you will find out that there is a distinct square in the middle of the image. Now this square is moving. It is made possible due to the strange alignment of the red, orange and yellow stripe creating a perception in our mind that the square in the center is moving relatively to itself and not in a particular direction only.