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Solution:

This is one the tricky one. Your eyes can never believe that they are actually of same sizes. Even if you see our explained image, you might not believe. This is the beauty of perspective, you can almost create magic. Coming back to the point, yes they indeed are of same sizes as you can see in our rough measurement.

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:

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 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.

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Now this effect is commonly used in so many basic illusions as well as complex ones. The logic behind it is that the tinted orange color wave-lines are creating an illusion on the background. The tint effect cannot be seen with the purple colored lines. While purple is promoting the white background, the orange color is creating its own tint in the background.