Sense and Perception

How do we see, hear, or smell? How does how we see affect what we see?
How does the quality of light change our perception?

Examine the nature of sense and perception. Explore the mysteries of a camera obscura and participate in hands-on activities related to light, sight, and how our eyes and brain work.

Of Vision and Art

How is how we see reflected or manipulated in works of art?
What does it mean to walk into a work of art that surrounds us?
How does looking up at the sky change the way we look at ourselves?
How does an aerial view of our world make us see things in a new way?

Activities that encourage you to see things from a new perspective, and create your own artwork.

Activities:

How we see & How we see affects what we are seeing.

Nature of Light

A light wave consists of energy in the form of electric and magnetic fields. The fields vibrate at right angles to the direction of movement of the wave, and at right angles to each other. Because light has both electric and magnetic fields, it is also referred to as electromagnetic radiation.

Nature of Color

Light waves also come in many frequencies. The frequency is the number of waves that pass a point in space during any time interval, usually one second. It is measured in units of cycles (waves) per second, or Hertz (Hz). The frequency of visible light is referred to as color, and ranges from 430 trillion Hz, seen as red, to 750 trillion Hz, seen as violet. Again, the full range of frequencies extends beyond the visible spectrum, from less than one billion Hz, as in radio waves, to greater than 3 billion billion Hz, as in gamma rays.



How Light Works
by Craig Freudenrich, Ph.D.
http://science.howstuffworks.com/light.htm

Vision and the eye

When light enters the eye, it first passes through the cornea, then the aqueous humor, lens and vitreous humor. Ultimately it reaches the retina, which is the light-sensing structure of the eye. The retina contains two types of cells, called rods and cones. Rods handle vision in low light, and cones handle color vision and detail. When light contacts these two types of cells, a series of complex chemical reactions occurs. The chemical that is formed (activated rhodopsin) creates electrical impulses in the optic nerve. Rhodopsin is a mixture of a protein called scotopsin and 11-cis-retinal -- the latter is derived from vitamin A (which is why a lack of vitamin A causes vision problems). Rhodopsin decomposes when it is exposed to light because light causes a physical change in the 11-cis-retinal portion of the rhodopsin, changing it to all-trans retinal. This first reaction takes only a few trillionths of a second. The 11-cis-retinal is an angulated molecule, while all-trans retinal is a straight molecule. This makes the chemical unstable. Rhodopsin breaks down into several intermediate compounds, but eventually (in less than a second) forms metarhodopsin II (activated rhodopsin). This chemical causes electrical impulses that are transmitted to the brain and interpreted as light

Activities:
· Afterimages
· Prisms - splitting white light into its component wave lengths
· Complimentary colors
· Stereo scope / phenakistoscope
· obscura - redirected rays
· Figure / ground
· ?(Zoetrope / flip books)
· paper air planes / constructions which illustrate the atmospheric density

Topics:
· Development = Vision on atmospheric conceptions
· Brain Activity = retinal images interpreted
· Color = reflective qualities / cone chemistry
· Depth/Distance = luminance, contrast, rod activity
· Motion = luminance, contrast, rod activity
· Contrast = luminance, rod activity

Persistence of Vision
Finger animations
Color Blends

Lenses - bending light rays/ virtual and real images

When light rays reach an angulated surface it causes the light rays to bend. This is called refraction.

Light passing through a convex lens, the light rays bend toward the center:

Light passing through a concave lens, the light rays bend away from the center:

Concave
Convex
Mirrors
Broken straws

Prisms - splitting light into the visible spectrum
Bluesky
water prism
Spectrum
Waves

Obscura
Real Images
Cameras
The eye

Activities:

Exploring basic principles of visual perception at play in works of art.

Line - Dimensionality - 2 and 3 D /
Color - light/ pigment/luminance
Photography - silver halides / light sensitivity/reaction / Digital?
Film - persistence of vision
Spacial conceptions - moon ?

Activities:

· Sun Prints -
· Flip books

Topics:
· Time
· Scale/Dimension
· Perspective
· Interpretation

Examples from:
· Turrell
· Duchamp
· Muybridge
· Man Ray
· Kenneth Noland
· Joseph Albers
· Roy Lichtenstein
· Hockney?
· Impressionists

Persistence of Vision
Finger animations
Flip Books

Lenses - bending light rays/ virtual and real images
Concave
Convex
Mirrors

19th Century Optical Devices

Zoetropes
Phenakistascopes

Camera Obscura
Real Images
The eye
Obscura

Reading/Materials List: