Optical Illusions. Seeing Is Deceiving. Christopher Landauer Science of Art March 9, 2000. What is an Illusion?. il·lu·sion ( î -l ¡¹ zh e n ) noun 1. a. An erroneous perception of reality. b. An erroneous concept or belief.
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Seeing Is Deceiving
Science of Art
March 9, 2000
il·lu·sion (î-l¡¹zhen) noun
1. a. An erroneous perception of reality.
b. An erroneous concept or belief.
2.The condition of being deceived by a false perception or belief.
3.Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.
4.Illusionism in art.
c. 450 B.C.
“The mind sees and the mind hears. The rest is blind and deaf.”
“Man is nothing but a bundle of sensations”
c. 300 B.C.
“We must perceive objects through the senses but with the mind”
384 - 322 B.C.
“Each sense has one kind of object which it discerns, and never errs
in reporting that what is before it is color or sound; Although, it
may err as to what it is that is colored or where it is, or what it is
that is sounding, or where it is.”
A. Ideal Parthenon
B. Architrave Illusion
C. Illusionary Distortion
D. Alterations made to offset illusion
“For the sight follows gracious contours; and unless we flatter its pleasure by proportionate alterations of the modules--so that by adjustment there is added the amount to which suffers illusion--an uncouth and ungracious aspect will be presented to the spectators.”
Convexing of column to overcome parallel lines appearing concave
Bright objects appear larger
“More of an Art than a Science”
Early Preparadaigmatic Science
-Trial and error
-Aesthetic, not scientific
-No factual understanding
-No schools of thought
1596 - 1650Descartes:
There is both a registration stage and an interpretation stage in the perceptual process. Perceptual error or illusion may intrude at either of these two steps along the road to consciousness.
1700 - 1800Given at Birth vs. Learned through Experience
Reid & Kant:
All knowledge of the external world comes directly
through the senses and is interpreted by innate mechanisms
Berkeley & Hume:
All perceptual qualities are learned through experience with the environment
Paradigmatic Science (Psychology)
Normal Sciences => Anomoly => Crisis => Revolution
Current status: Normal Science
- mopping up
- puzzle solving
- guidelines for research
Face or Vase?
L'Amour de Pierrot c.1905
Gossip and Satan
Geo. A. Wotherspoon
The Great Panoramic
- Salvadore Dali, 1936
Cube looks like a cube.
“Equal sides and right angles.”
Eye: Perspetive projection
Reverse: Topless pyramid change of shape
Cube looks distorted, on face smaller than the other.
Depth is paradoxical
Reverse: No Change
Cube does not look like a cube.
Eye: Near face is same size as far face
Reverse: Topless pyramid further face always looks larger
Necker Cube. No face is front or back by perspective
Depth is paradoxical
Reverse: No change
3 in 1 Illusion
Cube / Room