Shady Optical Illusion
Intro: Shady Optical Illusion
Here's a simple yet surprising optical illusion that can be made within minutes. It involves four different shades of blue that border each other. The shades go from lightest to darkest when viewed from left to right.
The illusion comes into play when an object is placed along the borders of each successive shade. Something strange occurs with our perception of the obvious difference in shades. In fact, neighboring shades appear to be precisely the same!
Here's a video that showcases the full effect of the illusion:
The illusion comes into play when an object is placed along the borders of each successive shade. Something strange occurs with our perception of the obvious difference in shades. In fact, neighboring shades appear to be precisely the same!
Here's a video that showcases the full effect of the illusion:
STEP 1: What You Need
Sometimes simple is better. For this project, only the following items are necessary:
1) A sheet of 8.5" x 11" paper
2) Scissors
3) Pencil
4) A program that you can draw in (i.e. Photoshop, Paint, etc.)
1) A sheet of 8.5" x 11" paper
2) Scissors
3) Pencil
4) A program that you can draw in (i.e. Photoshop, Paint, etc.)
STEP 2: Creating the Illusion
This is extremely easy to create by using a drawing program. I used Photoshop CS3, but that is entirely unnecesssary. MS Paint is sufficient for this. I will show how I did it in Photoshop.
First of all, open a new project and select the rectangular marquee tool.
Then using that tool just create a rectangle that fills one fourth of the blank project. Fill this in with a very light shade of blue (light cyan specifically). Using the next lightest shade of blue (pure cyan), do the same thing. For the third and fourth quarters of the project, use the next two lightest shades of blue in order (dark cyan and darker cyan respectively).
Now the project can be saved and printed. After printing, cut away the white border around your project. This will eventually enhance the effect of the illusion.
First of all, open a new project and select the rectangular marquee tool.
Then using that tool just create a rectangle that fills one fourth of the blank project. Fill this in with a very light shade of blue (light cyan specifically). Using the next lightest shade of blue (pure cyan), do the same thing. For the third and fourth quarters of the project, use the next two lightest shades of blue in order (dark cyan and darker cyan respectively).
Now the project can be saved and printed. After printing, cut away the white border around your project. This will eventually enhance the effect of the illusion.
STEP 3: Presenting the Illusion
Now that a finished product is in hand, it's time to present the illusion to yourself and/or to others. This is the best part!!
Place the pencil over the transition border between the first two shades of blue on the far left. It will amazingly appear that the first two shades of blue are exactly the same! The same visual phenomenon will hold true when the pencil is moved to the border between the second and third shades. Finally, move the pencil to the transition border between the third and fourth shades. Each time a border is covered, the eye perceives the neighboring shades as being identical. Clearly they are not.
Again, here is the video that shows the illusion being performed. Enjoy!:
Place the pencil over the transition border between the first two shades of blue on the far left. It will amazingly appear that the first two shades of blue are exactly the same! The same visual phenomenon will hold true when the pencil is moved to the border between the second and third shades. Finally, move the pencil to the transition border between the third and fourth shades. Each time a border is covered, the eye perceives the neighboring shades as being identical. Clearly they are not.
Again, here is the video that shows the illusion being performed. Enjoy!:
20 Comments
WallaceTheSane 14 years ago
I wouldn't be surprised if this was a pre-processing phenomenon, related to the cells near the eye that encode information for the brain. They perform lots of strange compression schemes on all our input data, and many of them are line-based.
greeenpro 14 years ago
I want to take that class!
You may have learned in the class that our brains basically put contrasts ahead of color tones (in terms of priority of processing). This illusion takes advantage of that when the pencil covers the contrast areas. Since there is no contrast perceived, we see the same tone when the two tones are just slighty different. Obviously, when the contrast is then revealed, we can suddenly perceive the difference in tones. That's the best way I can describe the phenomenon right now.
Thanks so much for viewing and commenting!
WallaceTheSane 14 years ago
dissapeared literally before our eyes. It just became less and less opaque, but it was timed perfectly. Any faster and we would have seen it. It blew our minds.
The class was called "Introduction to Cognitive Science." We were told that very few schools teach Cognitive Science explicitly. It was the absolute best class I have ever taken. On of my projects was to design the neural architecture of an insect. I recommend taking a class on it, or reading a book about it if you can.
Cheers!
greeenpro 14 years ago
Cognitive science is so fascinating, I like to delve into it in my spare time.
That sounds like an amazing class that you took, and the video you mentioned really sounds neat. You don't happen to know the name of the video, do you (or know where or how I could somehow find/watch it )?
Cheers.
WallaceTheSane 14 years ago
http://www.michaelbach.de/ot/
http://www.johnsadowski.com/big_spanish_castle.html#
or_ford98 12 years ago
eulaliaaaa! 14 years ago
:-O
What if you covered ALL the lines? THAT would be interesting. I'll try that.
or_ford98 12 years ago
zypher3.14 13 years ago
greeenpro 13 years ago
Puzzledd 13 years ago
greeenpro 13 years ago
Karroo Oakey 14 years ago
Kiteman 14 years ago
That is...
...gosh!
(Can anybody explain this? There must be a huge project on colour-perception in this for any college or university students out there!)
Kiteman 14 years ago
greeenpro 14 years ago
Koosie 14 years ago
greeenpro 14 years ago
Kaiven 14 years ago
mbudde 14 years ago