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Optical Illusions:

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Nikita Kharse

on 23 June 2016

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Transcript of Optical Illusions:

Optical Illusions
Defying Visual Perception
What are optical illusions?
What is Op-Art?
Who "created" optical illusions?
Where do we see illusions in our every-day lives?
How do optical illusions manipulate the eye?
There is a long way ahead of us, so let's get started!
What are optical
illusions
?
Optical illusions are
deceptions.
As a primitive instinct, our brains are hardwired to identify human faces.
ex) Have you ever looked at a drawing of natural scenery, but have instead seen a face rather than the lush, green foliage?
What is Op-Art?
Illusionary art (or Op-Art) was invented around the 1960s by a man named Victor Vasarely.
Creating Op-Art, Vasarely revolutionized the world of geometric art. Our modern art is based off of his idea.
Accordingly, Vasarely was considered a kinetic artist, or an artist who specialized in op-art.
Looking at this picture, what do you see?
Op-Art...
is a geometric-based style of graphic art
plays games with the basic mechanics of the eye
often uses both positive and negative light compositions for a maximum mirage effect
*In the 1960s, it took a lot of planning, math, and technical skill to create such pieces of op art, due to the limited access to computers at the time.
Who "created" optical illusions?
People have known of the idea of optical illusions for years, however, it wasn't until around 450 BCE until there was one common term and a dedicated science to optical illusions.
Disbelief of such a “power” as optical illusions spread around 450 BCE, the time of two Greek scientists: Epicharmus and Protagoras.
There are more records of Protagorus compared to Epicharmus due to Protagorus's high status in ancient Greek society.
Vocabulary
illusion
- a thing that is or is likely to be
wrongly perceived or
interpreted by the senses.

sophist
- a specific kind of teacher in
both Ancient Greece and in the
Roman Empire

deception
- believing something that is
not true

perception
- one's perspective

Illusionary art
- an art in which
something is being
deceived by producing a
false or misleading
impression of reality

Where do we see illusions in our every-day lives?
Did you ever notice while on the road how road stripes are closer together on turns? This is an example of an illusion!
Illusions surround people across the globe every day. Here is how!
Why?
not many drivers notice the close proximity of the stripes while driving
Here's another trick!
Blurred lines trick the brain into visualizing motion.
How does this relate?
animations can use this trick to easen up a little on the graphics, without changing the effect
entoptic phenomena-
visual effects
whose source
is within the eye
itself

Nikita Kharse
How do optical illusions manipulate the eye?
In the process, there is a slight delay between an actual event and our “conscious perception” of it.
This means that the world we perceive is actually just slightly in the past; about one-tenth of a second in the past.
Optical illusions are caused when the brain does not understand the variation between what exists and what doesn’t.
Optical illusions are caused when the brain does not understand the variation between what exists and what doesn’t.
Floaters are caused by irregularities in eye fluids and become common with age.
The brain's cortex is...
...HERE.
FUN FACTS!
75% of information collected from our five senses comes from our vision.
When we look at something, our brain receives impulses of information from our optic nerves which is how we process the information we see.
Most illusions come from misperceptions in the retina, but there are some cases in which they could come from the cortex.
The retina is...
...HERE.
The cortex is...
...HERE.
The brain is always trying to predict what will happen next.
When the brain processes information collected by the eye, it gets transferred into a part of the brain called the Occipital Lobe.
Located inside the occipital lobe is the cerebral cortex.
cerebral cortex- part of the brain made for processing information that was originally seen from the eye
The eye also has a say in determining one's visual perception!
Nerve fibers determine one’s emotion.
They put false
perceptions
in front of reality.

Did You Know?
One’s blind spot is caused due to a particular absence in special cells inside your eye that help you see, rods and cones. Where the optic nerve “collides” with the retina is where your blind spot exists in your eye.

The optic nerve is technically part of the eye and connected to the ocular bulb (the white part of your eye), but scientists consider it to be largely associated with the central nervous system, so it is classified as part of the central nervous system.
retina
optic nerve
instead, they feel as if they are going too fast
as a result, drivers slow down after witnessing the illusion that they don’t even know exists
animations can become much more lifelike with blurred lines being seen as motion in still pictures
Defying Visual Perception
What are optical illusions?
What is op-art?
Who "created" optical illusions?
How do optical illusions manipulate the eye?
Protagorus was an ancient Greek philosopher, scientist, and
sophist
by Plato.
Remember...
...a
sophist
is a a specific kind of teacher in both Ancient Greece and in the Roman Empire (who taught for charge)
Protagorus helped with the discovery of
entoptic phenomena

Epicharmus was an ancient Greek scientist around 450 BCE.
Remember...
entopic phenomena is a visual effect
whose source is within the eye itself.

ex) Floaters:
And this is just the TIP OF THE ICEBERG in the world of optical illusions!
Hope you enjoyed this presentation!
Bibliography
www.comicsandmemes.com
www.dailygalaxy.com
www.middlexeseye.com
geetaeyeclinic.com
www.opticalillusioncollection.com
www.marvellous-provence.com


http://en.wikipedia.org/wiki/Protagoras
classics.arizona.edu
www.memorylossonline.com
www.boredpanda.com
www.boredpanda.com
Deeper inside the cerebral cortex is a part of the brain called the visual cortex.
The optic nerve (the second of many cranial nerves inside the head) is located in the back of the eye.
It is made of millions of nerve cells that connect to even smaller, stringy extensions of the nerve cell called nerve fibers.
Brightness, tilt, colors, and the movement of one object plays a crucial role in deceiving the mind.
Illusions are an example of the brain failing to understand the visual dimensions of the physical world.
The job of the optic nerve is to send the information of what we see in the present...
...to the retina (a thin liquidated layer made of special cells called rods and cones) through electrical impulses.
Optical Illusions
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