optical illusion

Duck/Rabbit Illusion - 16/52

duck rabbit illusion

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

This is a classic, over 100 years old. If you see a duck: look at the image, and think of the duck's beak as rabbit ears. If you see a rabbit: think of the rabbit's ears as the beak of duck. 

The Duck-Rabbit Ambiguous Figure was created by an anonymous illustrator in late 19thCentury Germany, and first published in 1892 in the humour magazine Fliegende Blätter. It was subsequently published and popularised by Jospeh Jastrow (1900).

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You should experience a 'Gestalt switch' between seeing the image as a duck and a rabbit.

There is some controversy over how the Duck-Rabbit Ambiguous Figure works. It is generally agreed that the retinal image is constant when experiencing the figure, but what is not agreed is whether the visual experience of the figure changes when the perspectival switch takes place between seeing the duck versus the rabbit, or whether the experience itself does not change, and it is some post-experiential belief, judgment, or other mental process which changes. The Duck-Rabbit, among other ambiguous figures, has been cited in debates over this issue (Silins 2015: §2.4).

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Watercolour illusion - 15/52

waterfall illusion

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

Look at the space inside the large rectangle, and the space between the smaller rectangles withint it. Are these spaces the same colour?

The watercolour illusion exhibits two remarkable phenomena: firstly, there is a long-range ‘spreading’ of a pale colour from one or more brightly coloured contours into the surrounding space; secondly, there is a pronounced figure-ground effect, in which certain elements will be perceived as having a definite shape (the figure) while others are perceived as a formless ground which is being occluded by the figure. In the main image on this page, the space inside the two smaller contours appears as the ground, which we glimpse through gaps in the figure bounded by the larger contour.

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Sound-Induced Flash Illusion - 14/52

sound induced flash

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

Another sound illusion, the Sound-Flash Effect is a cross-modal illusion in which what you experience visually is affected by what you hear. It is the result of asynchronous visual and auditory stimuli.

Watch the video below with the sound on. Each time a disk appears, how many times does it seem to flash?

The disk always flashes once. Sometimes it is accompanied by one beep, and then people report one flash. However, when it is accompanied by two beeps some people report experiencing two flashes

In the Sound-Induced Flash illusion, what you visually experience is affected by what you hear. The illusion was discovered and studied by Ladan Shams and colleagues (Shams et al. 2000). As can be seen in the video above, although the same number of dots flashes on the screen when one and two beeps are sounded, when there are two beeps, people frequently report experiencing two flashes. Shams and colleagues hypothesise that the “alteration of the visual percept is due to cross-modal perceptual interactions as opposed to cognitive, attentional, or other origins” (Shams et al. 2002).

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The Waterfall Illusion - 13/52

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I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

Waterfall illusion, or motion aftereffect, is an illusion of movement. It is experienced after watching a stimulus moving in one direction for some time, and then looking at a stationary scene. The stationary scene appears to have movement (in the opposite direction to the moving stimulus that one previously watched).

This is called the “waterfall illusion”, as it can be experienced after watching the motion of the water in a waterfall, and then attending to a stationary scene, for example the rocks by the side of the waterfall. Robert Addams popularised this illusion in 1834 after a trip to the Falls of Foyers in Scotland

Start the video below and stare in the middle and see what happens

How did you get on weird hey?!

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Kanizsa Triangle - 12/52

Kanizsa Triangle

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

INSTRUCTIONS

What shapes do you experience in the figure? What shapes are there in the figure?

EFFECT

The figure is often experienced as a solid triangle pointing upwards that is lighter than the background, which occludes an inverted triangle pointing downwards, and a set of black discs which are also occluded by the solid bright white triangle that points upwards. Surprisingly, none of these shapes are actually present in the figure

The Kanizsa triangle illusion makes us realise the way our visual systems work—which we do not notice in our everyday experience. Looking at the figure, most people will have the visual experience of an apparent brightness contour defining an upright triangle which is occluding three black discs and a second, inverted triangle outlined in black. Of course, these triangles do not in fact exist, and we are not perceiving occluded discs but rather ‘Pac-Man’-like fragments of discs. (‘Pacmen’ is now the standard nomenclature for such inducing elements). 

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The Ames Room - 10/52

Ames Room

I love optical illusions so I thought I would share a few of my favorite and with many people opting to take up 365 day challenges i thought i would try a 52 week challenge in which i will share with you a different Illusion every week. so if you have any you would like me to feature get in touch.

The Ames Room is one of the best (and most famous) examples of how perception is not always the same as the reality of what's in front of them. When viewed from the front, an Ames Room appears to be a normal, square room with walls perpendicular to floor and ceiling. However, the back wall is in fact built at a sharp angle and the floor and ceiling are steeply slanted.

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This creates an illusion that makes people and objects on one side of the room seem much smaller or larger than people or objects on the other side of the room. Since perspective is important, many Ames Room models have some sort of pinhole viewing device so that the viewer sees the room from an angle where they cannot perceive the slanted floor and the different lengths of the walls. The idea behind the Ames Room has been used in movies such as "The Lord of the Rings" series to make some actors seem much shorter or taller than they really are.

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