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A horse of a different color... or not

Bear Bibeault
Author and ninkuma
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  67



What's the difference between squares A and B?





















Nothing... they are the same color.


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Stephan van Hulst
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  17

I enjoy these.

I really like the ones used in Bloch and Gafter's Java Puzzlers too.

Here's another well known illusion:

David O'Meara
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Bear Bibeault wrote:What's the difference between squares A and B?

they're not straight.
Saurabh Pillai
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Bear Bibeault wrote:Nothing... they are the same color.



I do not get it. Square A is Black and Square B is White?
Bear Bibeault
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Saurabh Pillai wrote:
Bear Bibeault wrote:Nothing... they are the same color.

I do not get it. Square A is Black and Square B is White?

Nope. They are both exactly the same shade of gray. (rgb #787878 to be exact).


Bear Bibeault
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  67

Ben Kenobi wrote:Your eyes can deceive you... don't trust them
Saurabh Pillai
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Bear Bibeault wrote:
Saurabh Pillai wrote:
Bear Bibeault wrote:Nothing... they are the same color.

I do not get it. Square A is Black and Square B is White?

Nope. They are both exactly the same shade of gray. (rgb #787878 to be exact).


OK. Technically they are (may be) same but they do look different,right? It's not just me who finds them different?
Bear Bibeault
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  67

That's the whole point of the illusion.

Saurabh Pillai wrote:they are (may be) same ...

There's no "may be". They are the exact same color.
Mike Simmons
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  10
Saurabh Pillai wrote:OK. Technically

Absolutely
Saurabh Pillai wrote:they are (may be)

are
Saurabh Pillai wrote:same but they do look different,right? It's not just me who finds them different?

Indeed, it's not just you. It's most of us - me too. But that's the point of these images - they are optical illusions. They are patterns that trick our minds into believing something that isn't true.
Mike Simmons
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  10
More cool illusions from psychologist Akiyoshi Kitaoka. That page was referenced by Bloch and Gafter in Java Puzzlers, and they got their cover art from him. Also the third one down may look familiar to viewers of this thread.
Ernest Friedman-Hill
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I use the one Bear showed as part of an art class I've taught to kids. Once you really understand that what you see is just a rendering of reality, your real art training can begin.


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David O'Meara
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Also due to the way in which eyes see color there may be colors that cannot be seen. I'll find a link later.
Joe Borderi
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Bear Bibeault wrote:

What's the difference between squares A and B?

Nothing... they are the same color.


I am absolutely not buying that squares A and B are the same color.

You can remove any optical illusion part of this by simply using your hands to block out any surrounding squares, shadows, and colors. You can plainly see that square A is some shade of gray and that B is some shade of off-white.

If you told me that the letters A and B were the same color, then I might buy that after some further tests and investigation.
Matthew Brown
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    8

Joe Borderi wrote:I am absolutely not buying that squares A and B are the same color.

You can remove any optical illusion part of this by simply using your hands to block out any surrounding squares, shadows, and colors. You can plainly see that square A is some shade of gray and that B is some shade of off-white.

If you're using Firefox - try installing the ColorZilla plugin. That gives you an eye-dropper tool that tells you the RGB value of any point on the page. And that will tell you Bear is right: #787878 in both squares.
Joe Borderi
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Matthew Brown wrote:If you're using Firefox - try installing the ColorZilla plugin. That gives you an eye-dropper tool that tells you the RGB value of any point on the page. And that will tell you Bear is right: #787878 in both squares.


Pretty sneaky sis....

I do use Firefox, but I didn't want to install yet another add-on, so I went old school. I just cut-and-pasted a swath from square A and juxtaposed it with square B. Now it certainly passes the eyeball test.


[Thumbnail for 772px-Grey_square_optical_illusion.PNG]

Joe Borderi
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Stephan van Hulst wrote:I enjoy these.

I really like the ones used in Bloch and Gafter's Java Puzzlers too.

Here's another well known illusion:



What is the illusion?
Matthew Brown
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    8

It's to do with the direction of rotation. Both directions are valid, although most people see it as rotating clockwise, I think. There's more information here.
Saurabh Pillai
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Matthew Brown wrote:It's to do with the direction of rotation. Both directions are valid, although most people see it as rotating clockwise, I think. There's more information here.


F**k... You're right dude. I mean this is amazing. This is one of many ways to exploit human body as there are bugs in the system.

Have they(bugs) been left purposely by almighty or ...?

Those who can not see that girl dancing in clock and counterclockwise, look at her leg continuously, now look somewhere else for a moment , now again look at her legs, I think you should see her rotating both way.

Amazing.
Mike Simmons
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  10
Joe Borderi wrote:You can remove any optical illusion part of this by simply using your hands to block out any surrounding squares, shadows, and colors. You can plainly see that square A is some shade of gray and that B is some shade of off-white.

Hmm... that's exactly what I did, but I can plainly see they're the same.
marc weber
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Matthew Brown wrote:... If you're using Firefox - try installing the ColorZilla plugin. That gives you an eye-dropper tool that tells you the RGB value of any point on the page...

Or DigitalColor Meter on Macs. Indeed, they are the same.

"I see it, but I don't believe it."


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Girish Vasmatkar
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Matthew Brown wrote:It's to do with the direction of rotation. Both directions are valid, although most people see it as rotating clockwise, I think. There's more information here.


Finding it pretty hard to perceive the direction of rotation as anti-clockwise. The wiki link says, if you perceive the touching leg (to the ground) as the right foot (which I am unable to perceive), the rotation will appear to anti-clockwise.

Heck, I only see it in clockwise direction.
santoshkumar savadatti
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I am absolutely not buying that squares A and B are the same color.



Anybody who's designed web pages has (badly) experienced it.
You choose a color.Then you use it. Only....you find the same colour looks different shade when it is among a different set of additional colors.
Stephan van Hulst
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  17

Girish Vasmatkar wrote:
Matthew Brown wrote:It's to do with the direction of rotation. Both directions are valid, although most people see it as rotating clockwise, I think. There's more information here.


Finding it pretty hard to perceive the direction of rotation as anti-clockwise. The wiki link says, if you perceive the touching leg (to the ground) as the right foot (which I am unable to perceive), the rotation will appear to anti-clockwise.

Heck, I only see it in clockwise direction.

Saurabh Pillai
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In modified version it is somehow easy to find both direction. There is one on Wikipedia page too at the bottom.
Girish Vasmatkar
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Stephan van Hulst wrote:
Girish Vasmatkar wrote:
Matthew Brown wrote:It's to do with the direction of rotation. Both directions are valid, although most people see it as rotating clockwise, I think. There's more information here.


Finding it pretty hard to perceive the direction of rotation as anti-clockwise. The wiki link says, if you perceive the touching leg (to the ground) as the right foot (which I am unable to perceive), the rotation will appear to anti-clockwise.

Heck, I only see it in clockwise direction.




Thanks Stephen, huge relief. Phew
Bear Bibeault
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  67

Another one. The "green" and "blue" spiral bands are the same color! #00ff96


Saurabh Pillai
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An easy one.
Pat Farrell
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santoshkumar savadatti wrote:Anybody who's designed web pages has (badly) experienced it. You choose a color....you find the same colour looks different shade when it is among a different set of additional colors.

What? people are designing colors on web pages? And they get it screwed up?

I'm not sure which is more of a shock, that folks get colors and images totally wrong or that anyone is still caring about web design. There is so much ugly stuff out there.
Deepak Bala
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    5

Bear, where do you get these cool optical illusions ?


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Bert Bates
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    5
Very, very nice.

I also REALLY liked the illusion rendered in Legos!

And... I also find it interesting that most people see the dancer going clockwise. Hmmm. And, fwiw, why do most people determine "clockwise" from a birds-eye view, not from an ant's-eye view?


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Bert Bates
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    5
oh, and another thing,

I find it's easiest for me to get the dancer to change directions when her extended leg is either rightmost or leftmost. It's much harder for me to make the change when the leg is sweeping left or right.
Wouter Oet
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Count the black dots:


"Any fool can write code that a computer can understand. Good programmers write code that humans can understand." --- Martin Fowler
Please correct my English.
Bear Bibeault
Author and ninkuma
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  67

Wow, that one gives me a headache!
Ernest Friedman-Hill
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Here is a link to a compilation of the most amazing optical illusions I've ever seen!!!
Deepak Bala
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Ernest Friedman-Hill wrote:Here is a link to a compilation of the most amazing optical illusions I've ever seen!!!


Imbelieveable and unpossible indeed.
chris webster
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  16

Time to start writing a new book, Bear. You clearly have too much time on your hands!


No more Blub for me, thank you, Vicar.
Bear Bibeault
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chris webster wrote:Time to start writing a new book, Bear.

Too late! Already started on one...
Jayesh A Lalwani
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Bear writes books faster than I can read them
Bear Bibeault
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I wish! "Ninja" took 2 years!

My new book will hopefully take less time.
Greg Charles
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Ernest Friedman-Hill wrote:Here is a link to a compilation of the most amazing optical illusions I've ever seen!!!


I'm completely amazed! Flabbergasted really. How is imgur not blocked from work for me? I mean, they block technical blogs because, you know, blog.

I stared at that d***ed cube for a solid minute before I got the trick.
 
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