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Optical Illusions

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Optical Illusions. What are optical illusions? They are ... There are different types of optical illusions. Some Different Types. Relative shape and size ... – PowerPoint PPT presentation

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Title: Optical Illusions


1
Optical Illusions
2
What are optical illusions?
  • They are images that appear to be something other
    than what they really are.
  • We tend to see what we expect rather than
    whats actually there.

3
There are different types of optical illusions.
4
Some Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

5
Which circle is bigger?
Theyre both the same size! WOW! What a surprise!
6
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7
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8
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9
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10
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11
Relative Size
  • An object surrounded by smaller objects seems
    larger than it actually is.

12
Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

13
Which line is longer?
Theyre both the same?No, its the red one...
14
Which line is longer?
15
Which line is longer?
16
Which line is longer?
17
Size constancy
  • Some people think that we are taught to see
    outward pointing arrows as far from us, and
    inward as close.

18
The lines are the same.
19
Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

20
What is this?
21
A native American?
22
Or an Eskimo?
23
What is this?
24
Perception
  • When shown a blurred picture, we tend to make
    hunches about it. When we have that hunch, its
    hard to let it go.

25
So what is this then?
26
A rabbit?
27
Or a duck?
28
Hmmn...
29
Last one...
30
Liar?
31
Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

32
Whats pictured here?
33
A cup?
34
Or two people?
35
Foreground/Background
  • When looking at pictures, we have to decide
    whats the object, and whats the background.

36
M.C. Escher, birds fish.
37
Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

38
How does this work?
39
Closure
  • If a figure has gaps, the mind tends to complete
    it, filling in the gaps.

40
How many legs?
41
Different Types
  • Relative shape and size
  • Size and shape constancies
  • Perception
  • Foreground/Background
  • Closure
  • Words and color

42
What does this say?
Are you sure?
43
How many colors?
44
Conclusion
  • Miscommunication between the brain and eyes
  • Uses assumptions
  • Not always carefully designed
  • Exists in everyday life
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