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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.

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You will find that when you read it aloud in a go, you will miss the fact that there are two 'The' written in between In and Hand. But you do will realize that if you look closely. The reason is that our brain fails to recognize the double word due to the placement of the words. This is the reason why the Pyramid shape was chose for the illusion.

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It is in and out at the same time. Confused? It is just a matter of perception and the way you would want to look at this image. At the first look, you can find it in or out. But at the second glance, you may find the same or even the opposite. If you concentrate you can find it in and out both. The reason is the 2d image of cube that is drawn in perspective 3D. This is why you tend to see the red dot inside the cube however it is not literally possible as it is just a 2D image.

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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.

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