Win a copy of The Little Book of Impediments (e-book only) this week in the Agile and Other Processes forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

A horse of a different color... or not

 
Bear Bibeault
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


What's the difference between squares A and B?





















Nothing... they are the same color.
 
Stephan van Hulst
Bartender
Pie
Posts: 6503
83
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Rancher
Posts: 13459
Android Eclipse IDE Ubuntu
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Bear Bibeault wrote:What's the difference between squares A and B?

they're not straight.
 
Saurabh Pillai
Ranch Hand
Posts: 524
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Ben Kenobi wrote:Your eyes can deceive you... don't trust them
 
Saurabh Pillai
Ranch Hand
Posts: 524
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 3090
14
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 3090
14
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
author and iconoclast
Marshal
Pie
Posts: 24212
35
Chrome Eclipse IDE Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
 
David O'Meara
Rancher
Posts: 13459
Android Eclipse IDE Ubuntu
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 151
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Bartender
Posts: 4568
9
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 151
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
772px-Grey_square_optical_illusion.PNG
[Thumbnail for 772px-Grey_square_optical_illusion.PNG]
 
Joe Borderi
Ranch Hand
Posts: 151
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Bartender
Posts: 4568
9
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 524
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 3090
14
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Sheriff
Posts: 11343
Java Mac Safari
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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."
 
Girish Vasmatkar
Ranch Hand
Posts: 201
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 95
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Bartender
Pie
Posts: 6503
83
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Ranch Hand
Posts: 524
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
In modified version it is somehow easy to find both direction. There is one on Wikipedia page too at the bottom.
 
Girish Vasmatkar
Ranch Hand
Posts: 201
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Another one. The "green" and "blue" spiral bands are the same color! #00ff96


 
Saurabh Pillai
Ranch Hand
Posts: 524
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
An easy one.
 
Pat Farrell
Rancher
Posts: 4678
7
Linux Mac OS X VI Editor
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Bartender
Posts: 6663
5
Firefox Browser Linux MyEclipse IDE
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Bear, where do you get these cool optical illusions ?
 
Bert Bates
author
Sheriff
Posts: 8905
5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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?
 
Bert Bates
author
Sheriff
Posts: 8905
5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Saloon Keeper
Posts: 2700
IntelliJ IDE Opera
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Count the black dots:
 
Bear Bibeault
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Wow, that one gives me a headache!
 
Ernest Friedman-Hill
author and iconoclast
Marshal
Pie
Posts: 24212
35
Chrome Eclipse IDE Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Here is a link to a compilation of the most amazing optical illusions I've ever seen!!!
 
Deepak Bala
Bartender
Posts: 6663
5
Firefox Browser Linux MyEclipse IDE
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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
Bartender
Posts: 2407
33
Linux Oracle Postgres Database Python Scala
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Time to start writing a new book, Bear. You clearly have too much time on your hands!
 
Bear Bibeault
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
chris webster wrote:Time to start writing a new book, Bear.

Too late! Already started on one...
 
Jayesh A Lalwani
Rancher
Posts: 2762
32
Eclipse IDE Spring Tomcat Server
  • Likes 3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Bear writes books faster than I can read them
 
Bear Bibeault
Author and ninkuma
Marshal
Pie
Posts: 65337
97
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I wish! "Ninja" took 2 years!

My new book will hopefully take less time.
 
Greg Charles
Sheriff
Posts: 3002
12
Firefox Browser IntelliJ IDE Java Mac Ruby
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
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.
 
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic