Overview
Here's how it works:- The inside of the window is covered with a translucent material that is used as a projection screen for shadows.
- An object is placed behind the widow, so it will cast a shadow on the window screening.
- The shadow is cast by two (or more) lamps in different positions that turn on and off.
- Each light source casts a shadow in a different position on the screen.
- As the different lights flash, the shadow appears to move.
![[diagram]](idffls_Diagram.bmp)
Details
Take a look at the
Chaney Electronics
#
C4622
strobe light.
![[photo]](idffls_C4622.jpg)
This kit has two small, straight xenon lamps and alternates between them, flashing back and forth.
The flash rate is not adjustable; about 120 per minute.
So, think of using that as the light source for the shadows.
Variations on this theme:
- You can use more than two light sources. Several lamps in a row, triggered in sequence, will make the shadow "run" across the screen.
- When the lamps are closer to each other, the shadow moves less. When the lamps are further apart, the shadow jumps a greater distance.
- When the lamps are further away from the object casting the shadow, the shadow moves less. When the lamps are closer to the object casting the shadow, the shadow jumps a greater distance.
- I like the lamps to be white, so the shadow just has the illusion of motion. But you can use colored lamps or gel filters.
- The screen material on the window can be almost anything that will transmit light from the back.
Some possibilities:
- white bed sheet
- cheese cloth
- tissue paper
- window "frosting" spray