Why does Scanimation (Animated optical illusions) move? Mechanism of Scanimation (Animated optical illusions)

Do you know the Scanimation (Animated optical illusions)? Scanimation (Animated optical illusions) are a certain play from the ancient times using the eye illusion. When you put transparency film which slit is drawn on plain paper which illustration is drawn, the illustration appears. When you slide transparency film, the illustration moves.

demonstration of Scanimation (Animated optical illusions)

This play is called by the various names. Some people know Animated optical illusion, Picket Fence Animation and Grid Bariier Animation.

By the way, why does Scanimation (Animated optical illusions) move. It's strange to see as the shape of the man or animal when you put the transparency film which slit is drawn on paper which unknown illustration is drawn.

In fact, the mysterious function of the brain is related there. This page explaining the mechanism of Scanimation (Animated optical illusions).

The mysterious function of the brain that an illustration moves

- Why does the flip book works? -

There are two functions of the brain that necessary for Scanimation (Animated optical illusions).

  • When we look at something similar consecutively, we recognize them that the same thing and supplement the interval where we do not see by the brain function.

  • When we look at something which the part can't be seen, we supplement the secret part by experience and knowledge, and we recognize the instantly whole of them by the brain function.

flip book image

Look at the example that the first function of the brain. please remember a flipbook. When the pages are turned rapidly with flipbook, the illustrates which drawn slightly differently on the edge of the notebook appear to animate.

Although each illustration should have stopped, why does the illustration move? The first function of the brain that same as Scanimation (Animated optical illusions) is related there.

When the pages are turned rapidly with flipbook, we see the illustration drawn on each page consecutively. We recognize those illustrations that the same thing by the brain function. Every time a page is turned over, the illustration is little changing one after another. The brain tries to correspond to a change because it recognizes them to be the same thing. As a result, the brain creates the images between the illustration and illustration.

imagination of basketball-man

The images that the brain created in this way makes man recognize the illustration is moving.

Then, let's actually experience the mysterious work of the brain using two illustrations. Please click the next illustration. Whenever it clicks, two illustrations change by turns. Please click continuously.

Person to get the ball

Aren't the ball and arm seen between the picture and the picture? This is the first function of the brain that necessary for Scanimation (Animated optical illusions).

The mysterious function of the brain that we can see the secret part of the illustration

Next it's explained about the 2nd function of the brain necessary for Scanimation (Animated optical illusions). When we look at something which the part can't be seen, we supplement the secret part by experience and knowledge, and we recognize the instantly whole of them by the brain function.

For example, when we look at photos which the neck of the giraffe, we can visualize the entire giraffe from its shape, color and pattern. It may be able to be judged from textures, whether it's a real giraffe or is a giraffe of a stuffed toy.

imagination of giraffe

Why can we do that so? We can recognize the giraffe because we know that, because we have the experience which we saw genuine giraffe, giraffe stuffed in books or TV or Zoo. Please do not say "It's natural". It's a mysterious power of human who sees something which isn't seen.

Please see the next illustration. The part of the illustration hides with a black stripes pattern.

Person to get the ball

Even though this illustration is half hidden by black stripes pattern, we recognize the same illustration as an illustration of the previous example.

About the workings of the brain not yet solved mostly. By many experiments and studies, it's thought that the next conditions are necessary so that man grasp the whole from part of the object image.

  • There is regularity in a hidden part

  • The percentage of the hidden part is less than 80 % of the whole

  • There is continuity in a seen part

Three conditions to see an illustration hidden by black stripes pattern

Let's consider the first condition in the previous illustration. There is regularity, isn't there? The striped design covering an illustration by a straight line at regular intervals.

There is the example that the illustration is covered by lines without a regularity. The half of the illustration is hidden as well as the previous illustration.

hidden man

Didn't it become difficult that you recognize the ball and man in comparison with the previous illustration? Even if you know the original illustration, it becomes difficult to feel the same illustration when the illustration is covered by lines without a regularity.

Let's see the 2nd condition. The percentage of the hidden part is less than 80 % of the whole.

Let's compare the illustrations that some percentage of the hidden part. The illustration that the width of black stripes pattern becomes thick gradually. How do you see illustrations?

hidden man by three frames slit-sheet
hidden man by four frames slit-sheet
hidden man by five frames slit-sheet

As the width of the black stripes becomes thick, isn't it becoming difficult that you recognize the ball and man?

Scanimation (Animated optical illusions) frame number corresponds to the width of the black stripes. To increase the number of frames must be thick black stripes width. General scanimation frame number limit is 5 frames. By the way, the next example corresponds to 3 to 5 frames of slit seat.

By the way, the last condition is "There is continuity in a seen part."

Please see the next illustration. Do you know what hides under black stripes pattern.?

hidden triangle

It's a triangle, isn't it? Why could it be imagined it? Possibly there may be nothing under black stripes pattern.

When it puts a ruler on each triangular side, we find out that a seen part equals straight.In other words, when also supposing that the straight line continues on a part hidden with black stripes pattern in the same way, it appears in the place where the continuance of the line should just appear next.

There is continuity in a seen part lines. In this case, we recognize that the line supposed under the stripe simply exists as it by the function of the brain. As a result, we recognize that there is the triangle. We recognize that there is something in the part which was covered with black stripes pattern.

hidden circle

Even if it's a curved line to hide at the black stripes pattern, it's same.It happens that not only the line but also the color. When the front and back of the stripe continue with the same color, we recognize that there is the same color in the part which was covered with black stripes pattern.

It means that the illustration for Scanimation (Animated optical illusions) should have simple lines and color. There is not the continuity of the line and color in the complicated illustration and the illustration which color changes gradually.

The human brain is really mysterious, isn't it? Well, we can see that a stopping thing moves. we can see something which there is nothing. Scanimation (Animated optical illusions) is a play by using such a mysterious brain function.