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FRASER SPIRAL

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1. We can observe several circles with little blue, green, white and black circles, shaped in a way that it looks like a rotating snake. We can see them moving like they are rotating on their own spaces.

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Describe your optical illusion, what do we see/not see?

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Describe your optical illusion, what do we see/not see?

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Describe your optical illusion, what do we see/not see?

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2. The peripheral drift illusion is a perception of movement in a static image and it's caused by the brain's interpretation of patterns seen outside of the eye's area of focus. If one stares at a fixed point in the image the motion disappears in the area of focus.
https://whatis.techtarget.com/definition/peripheral-drift-illusion

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Fraser's spiral, also known as false spiral, or twisted cord illusion might seem like a spiral formed by a rope of two different colors. However, it actually consists of concentric circles of twisted cords.  The visual distortion is produced by combining a regular line pattern (the circles) with misaligned parts (the differently colored strands).

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1- We can see two persons in the same image, in one vision of the image we can see an women looking backwards to us but in an other vision we can see an old lady just like a witch.

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A related illusion is the watercolor effect: the region between the square frames appears to have a faint color, but is actually white.

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A related illusion is the watercolor effect: the region between the square frames appears to have a faint color, but is actually white.

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In the image above, we see the tower on the right as being more tilted than the one on the left.

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This optical illusion happens because our brain sees both images as one scene. " Two tall structures that are actually parallel, like two towers, will actually converge on the two-dimensional surface of the photo when photgraphed from below. [...] if two towers do not converge on the surface of a photo or image, as they do not in the Leaning Tower Illusion, our brain interprets the towers as diverging in real life."
references:
https://www.scientificamerican.com/slideshow/169-best-illusions/
https://www.illusionsindex.org/i/leaning-tower-illusion

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2- After "viewing" the image, the brain continues to process it subconsciously. This implies that your eyes are always attempting to figure out what they're seeing, and your brain is always guiding them where to look next.

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What does your optical illusion tell us about the visual system

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What does your optical illusion tell us about the visual system

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The Müller-Lyer illusion is a image or and object, where two horizontal bars are the same lenght but one appers to be much longer than the other one. This happens because

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Visual perception is a dynamic process that goes much beyond simply replicating the visual information provided by the retina and compel the brain to make decisions about how we perceive things.

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"Moirémotion", the new book by Japanese artist Takahiro Kurashima is a set of abstract graphic patterns that start to move as soon as the reader overlays them with the special film enclosed. Morié-effects create complex shapes, make circles start to spin, and set graphic patterns vibrating. The book is a virtuoso sequel to Kurashima’s Poemotion 1–3 series that has sold almost 100.000 copies worldwide.

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When the fins are pointing in toward the shaft of the line, we perceive it as sloping away much like the corner of a building.

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In this illusion, we can see two different images. The first one is a white vase in the center. The second one, are two people in black staring at each other. 

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What do we see/not see?

It is possible to see and identify a vase or two people facing each other in profile.

Describe how your illusion works.
If you focus on the white figure, you will see a vase, although, if you focus on the black figures, you will see two people facing each other in profile.

What does your optical illusion tell us about the visual system?
When two images are captured by our visual system and brain, and one of the images is seen as the background and one as a figure, our brain immediately used a shaping effect in which emerges from the common borders of the images captured and creates this distinction.
Usually, our brain classifies images according to what surrounds the figures. That creates the depth, height and etc. In the case of this optical illusion, since both counters are ambiguous (open to more than one interpretation; having a double meaning), our brain can interpret both the black or white areas as background or figure.

Curiosity
This optical illusion involves cognitive processing, so, with out prior knowledge of both figures of the two profile people and the vase, these reversible figures couldn't be alternately identified by our brain.