This document discusses optical illusions and how the human visual system can be deceived. It begins by explaining how sight is the most important sense for humans and how vision works through the eyes and brain. There are three main types of optical illusions: literal illusions that create different images than the objects, physiological illusions caused by excessive stimulation of the eyes or brain, and cognitive illusions where the mind fills in or obscures areas. Examples of different optical illusions that use photographs, shadows, 3D street art, and rotating/waving images are provided. The document concludes by stating that optical illusions can be an effective creative technique for advertising to get consumer attention and stick in their memories.

1. SINYAT PRESENTS
OPTICAL ILLUSION

2. Sure, we have five main senses – sight, hearing, taste, touch and smell – but about
75 per cent of the information humans receive about our environment comes from
our sight, making it the most ‘important’ of the five senses. The vision depends,
obviously, on the EYES to see (with optic receptors called rods and cones) and on
the BRAIN to make sense of what we see. The optic nerve at the back of the eye
connects to the central nervous system in the brain. The brain receives electrical
impulses (stimuli) from our eyes which are interpreted as SIGHT, but the brain
adds two extra ingredients to the received image: memory and interpretation (in
short, perception). Sometimes the brain is deceived by information received from
the eyes. Visual illusions are caused when differences occur between our
perceptions or expectations and the image seen by the eye. Actually, there are
particular illusions which deceive the human visual system into perceiving
something that is not present, or incorrectly perceiving what is present.

3. Types Of Optical Illusions
There are in all 3 types of optical illusions,namely:-
1} Literal Illusion
2} Physiological Illusion
3} Cognitive Illusion

4. 1}Literal Illusions
Literal optical illusions that create images that are different from
the objects that make them.
Like a rainbow or mirage

5. Physiological illusions, such as the afterimages following bright
lights, or adapting stimuli of excessively longer alternating
patterns are presumed to be the effects on the eyes or brain of
excessive stimulation or interaction with contextual or
competing stimuli of a specific type—brightness, colour,
position, tile, size, movement, etc.

6. “cognitive illusions”
The human eye has a blind spot where the optic disk is
located. We aren’t normally aware of this blind spot, but
with one eye closed, any object passing through this
small area will disappear momentarily. Our visual field
appears seamless because of an optical illusion: Our
mind conspires to fill in the blank area with the colours
of what surrounds it. We have other blind spots
too“cognitive illusions” – that our minds and our culture
work to obscure.

7. Photograph illusion

9. Photograph of eiffel tower or a ladies face

10. 
Shadow illusions

12. 3D Street art a form of illusion

19. .
Still image! Keeps rotating till you look at
it directly.

20. Waving hearts

21. Rotating flowers

22. Waving coffee beans

23. Snake like image due to the colour combination

25. For any advertising campaign to stand out from the
crowd, a little bit of creativity is needed. Every
company aims for an advert that will arose people’s
curiosity, one that will get consumer to look at it a
second or even third time. There are many techniques
used and the most wondrous of them is the optical
illusion which, if done right, will stick long in the
memories of consumers,

31. Let s have some fun and try a few
optical illusion

33. 
Rabbit or a duck ?

34. Very old and classical one. Those orange circles
are the same size by the way.

36. Count the Black Dots

37. Stare at the black dot