Janet was first inspired to this style of art medium while walking through a department store. She walked past a display for cosmetics and noticed the light bouncing off a piece of decorative cellophane. Prior to this, she had been working on a large installation focused on shadows, but felt she had taken this concept as far as she could. This new material opened the door for her and she found a new direction for her art.
She named her new creation a "sun drawing" (which she later patented). A sun drawing uses a reflective surface or material put into the path of a ray of light and is shown on the nearby walls and/or ceiling. As the light's path changes throughout the day, the scene reflected changes.
In her first experimentation of sun drawing works, she used transparent films in different colors and spacecraft/spacesuit insulation to create her pieces. Over time this process proved unable to withstand the test of time. Then she moved to glass, steel and bronze to make permanent sun drawing sculptures.
This new process allowed her to use the light of the sun to create the color palette she wanted instead of using the concept of prisms to reflect all the colors of the rainbow. This method is called light interference, where thin films are placed on the reflective surface in layers to obtain specific colors. One color is reflected and the opposite color penetrates the reflective surface and is shown on the other side. Janet discovered that she could use a separate reflective surface behind the initial one to bounce the opposite color (or transmission) and show both colors simultaneously. Then, as the earth rotates and the path of the sunlight changes, the two colors shown subtly change into two new colors.
http://www.janetsaadcook.com/
http://aaa.uoregon.edu/events/sun-drawing-lecture-janet-saad-cook.html
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