Have you ever played with a zoetrope? Zoetropes are simple devices that pre-date film animation. The viewer looks through the slits in a spinning cylinder and sees an animated image.
The device works on the principle that our brains are able to fill in the motion between frames. So as we view the image broken up by the dark spaces between the openings in the cylinder, the imagery is no longer blurry, and our brains perceive motion as the picture changes. It is an optical illusion referred to as persistence of vision. The name zoetrope comes from the Greek zoe and tropos, meaning "wheel of life".
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You can engineer your own zoetrope. All you need is a circular base, a way to make it spin, a dark colored cylinder with small slits cut into it, and a strip of paper with sequential drawings. In addition to the design we created below, there are all sorts of design ideas available on the internet. This zoetrope uses a cd for the base. This example uses a recycled container as a base. We designed ours from what we had around the house.
To make the zoetrope I will describe here, you'll need the following:
- Dark colored paper
- Scissors or an X-acto Knife
- Container like a pie tin
- Pencil or a dowel
- White printer paper
- Writing utensils for drawing
Cut a strip of the dark paper 2.5 in (~ 6 cm) wide, and 17 in (~ 43 cm) long. You will have to tape together two different strips to get the length if you are using a standard size piece of paper.
Then using your ruler, measure out the slits. We made ours 1 in (2.5 cm) apart and 1 in (2.5 cm) deep. Each slit was 1/8 in (~ 1/3 cm) wide. You can experiment with these dimensions to see how it changes the animation in your finished product!
Next, tape the strip of paper into a cylinder shape.
Poke a hole in the pie tin (or other container) with the pencil, or something pointy. Place the cylinder in the container. We used some tape to hold the cylinder in place.
Put the pencil through the hole and secure with tape if it is wobbly or loose.
Now comes the fun part! Draw yourself a cartoon on a strip of white paper. The paper should be no wider than the base of the cylinder. In other words, it should not obstruct the slits when placed in the zoetrope. In our case, no wider than 1.5 in (~ 3.5 cm).
We started with a simple design of a stick figure wiggling back and forth. You can also print out zoetrope designs here.
When you are finished, roll up the cartoon strip and place it down into the cylinder. As you spin the pencil in your hands, look through the slits at the cartoon. Voila! Animation!
This project is part of a larger series of engaging STEM projects and ideas. Check out the other posts here: The Best STEM Resources: An A-Z Guide for Exploring STEM.
Another cool way to explore the concept of persistence of vision!
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