Optical illusion
Here, we would like you to experiences the optical illusion, and realize what you might be seeing may not be the reality. Move the graphic form with your mouse till you satisfy and then check how what looks like differ from the reality.
In this page are the tools that you can move and try by yourself. Human beings cannot make sure what the reality is if he/she does not use tools.
In following optical illusion, though you may rationally understand that these are illusion, your eyes still see the different colors and twisted forms. This is the example of recognizing reality with the help of tools.
We still don’t know the mechanism of exactly how optical illusion occurs, though there are several hypotheses. But these tell us that human brain does not copy information as seen by their eyes. Until we “see” or recognize the information there happens various process in the brain. In the other words, information becomes twisted in this process in the brain.
*In this page, we use Java script to move figure and experience how it changes. If your java script is off, please turn it on to enjoy the experiment.
Brightness illusion #1
Two small boxes are identical, because we have duplicated one from another. The colors and gradations are same. However, box on left looks brighter and box on right looks darker.
You can grip and drag small boxes with mouse’s left click. As you move them around in the larger box, the colors of small boxes appear to be changing, though the color and shade is identical and not changing. Let us make sure that the color is not changing by following steps.
STEP1
With mouse, drag a small box down ward so that lower half of the small box sticks out from the larger box. Keeping this position, move the small box to right and left and you’ll see the color of small box does not change as much compared to when the whole small box was included in the larger box.(the degree of optical illusion change by how large the part of box is outside the larger box)
STEP2
Next, hide the larger box with hand or piece of paper and move small box as we have tried in STEP1. To our surprise, the color and shade of small box seems to not change at all. If you still see the color change in the small box, drag the small box out from the larger box completely and try to move slowly.
Brightness illusion #2
Color of cell “A” and cell “B” is identical. However, cell “A” look darker than cell “B”.
This is known as “Adelson's checker-shadow illusion”
You can grip and drag cell including “A” or “B” with left click of your mouse. Move them closer to each other; it becomes clear that these two are same color and shade. On the left edge, we placed a bar that has same color as the cell of “A” and “B”. You can move this bar also. Move and see the colors are identical.
You also can drag the cells including “A” and “B” to the bar and compare the color.
Reference：http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
Optical illusion of bulge
The center of this picture seems to be bulged. It looks as if a painter is using the combination of trapezoids to express the bulge, but all the cells are square and lines are strait.
Professor KITAOKA, Akiyoshi designed this using the optical illusion known as “checkered illusion”.
Move the ruler placed on the sides of picture and see this is made from squares.
Reference：Page of Optical Illusion of KITAOKA, Akiyoshi
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