9 of 10
9
Great Optical Illusions (Was: Why color cannot just be wavelength).
Posted: 24 October 2012 04:11 AM   [ Ignore ]   [ # 121 ]
Administrator
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  15435
Joined  2006-02-14

Richard Wiseman’s blog does it again:

Tunnel illusion!

tunnelillusion.jpg

 Signature 

Doug

-:- -:—:- -:—:- -:—:- -:—:- -:—:-

El sueño de la razón produce monstruos

Profile
 
 
Posted: 24 October 2012 07:37 AM   [ Ignore ]   [ # 122 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3063
Joined  2010-04-26

That thing is trippy.

 Signature 

“In the end nature is horrific and teaches us nothing.” -Mutual of Omicron

Profile
 
 
Posted: 24 October 2012 09:50 AM   [ Ignore ]   [ # 123 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3256
Joined  2011-08-15

I’ve just experienced a flashback! Kinda cool since I haven’t had one since the early 70’s. Now if you could have inagodadivida in the background I would really be back in time!


Cap’t Jack

 Signature 

One good schoolmaster is of more use than a hundred priests.

Thomas Paine

Profile
 
 
Posted: 24 October 2012 10:27 AM   [ Ignore ]   [ # 124 ]
Sr. Member
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3333
Joined  2011-11-04

It was the 70’s.  I and some guy that I knew had donned dresses earlier in the evening to amuse some girls who we were visiting. Inagodadavita was blaring and suddenly smoke was billowing out across the ceiling of their apartment.  An unattended teddy bear had been ignited by a lit candle…

Those were the days.

 Signature 

As a fabrication of our own consciousness, our assignations of meaning are no less “real”, but since humans and the fabrications of our consciousness are routinely fraught with error, it makes sense, to me, to, sometimes, question such fabrications.

Profile
 
 
Posted: 24 October 2012 11:52 AM   [ Ignore ]   [ # 125 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3256
Joined  2011-08-15

Can’t top that one Tim even if I lied! We wore the grooves off that album.


Cap’t Jack

 Signature 

One good schoolmaster is of more use than a hundred priests.

Thomas Paine

Profile
 
 
Posted: 25 October 2012 06:38 AM   [ Ignore ]   [ # 126 ]
Administrator
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  15435
Joined  2006-02-14

Another one: stare at the “+” sign in the middle and see the nonexistent green dot—

rotating-dots.gif

And HERE is the cool article it came from:

... what does the brain do when our eyes detect wavelengths from both ends of the light spectrum at once (i.e. red and violet light)? Generally speaking, it has two options for interpreting the input data:

a) Sum the input responses to produce a colour halfway between red and violet in the spectrum (which would in this case produce green – not a very representative colour of a red and violet mix)
b) Invent a new colour halfway between red and violet

Magenta is the evidence that the brain takes option b – it has apparently constructed a colour to bridge the gap between red and violet, because such a colour does not exist in the light spectrum. Magenta has no wavelength attributed to it, unlike all the other spectrum colours.

See also Wiki

Very cool!

 Signature 

Doug

-:- -:—:- -:—:- -:—:- -:—:- -:—:-

El sueño de la razón produce monstruos

Profile
 
 
Posted: 25 October 2012 07:26 AM   [ Ignore ]   [ # 127 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  9301
Joined  2006-08-29

This one is awesome!

I also noticed that after staring at it for a while, the magenta dots begin to disappear one by one, almost as if being eaten by the green dot. Like in Pac-Man.

Profile
 
 
Posted: 25 October 2012 07:47 AM   [ Ignore ]   [ # 128 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3063
Joined  2010-04-26

My brain seems to take a second or two to “create” the green dot.  It doesn’t show up until I’ve stared at it for about a full cycle and a half.  And if I stare at it long enough the purple dots start to get slightly off center green halos.  Neat.

 Signature 

“In the end nature is horrific and teaches us nothing.” -Mutual of Omicron

Profile
 
 
Posted: 25 October 2012 08:44 AM   [ Ignore ]   [ # 129 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3256
Joined  2011-08-15

My brain seems to take a second or two to “create” the green dot.  It doesn’t show up until I’ve stared at it for about a full cycle and a half.  And if I stare at it long enough the purple dots start to get slightly off center green halos.  Neat.


Yeah, I noticed the halos right off the bat when I looked at it. Some of the green dots even appeared inside the circle. Yet another example of how the brain can be fooled into seeing what really isn’t there. Like ghosts. And angels.

 

Cap’t Jack

 Signature 

One good schoolmaster is of more use than a hundred priests.

Thomas Paine

Profile
 
 
Posted: 25 October 2012 02:57 PM   [ Ignore ]   [ # 130 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  6166
Joined  2009-02-26

I had a few moments where I saw only the green dot circling.  Bizarre…

 Signature 

Art is the creation of that which evokes an emotional response, leading to thoughts of the noblest kind.
W4U

Profile
 
 
Posted: 25 October 2012 03:21 PM   [ Ignore ]   [ # 131 ]
Sr. Member
RankRankRankRankRankRankRankRankRankRank
Total Posts:  3333
Joined  2011-11-04

Is it significant that all of our brains are seeing a green dot?

 Signature 

As a fabrication of our own consciousness, our assignations of meaning are no less “real”, but since humans and the fabrications of our consciousness are routinely fraught with error, it makes sense, to me, to, sometimes, question such fabrications.

Profile
 
 
Posted: 25 October 2012 03:25 PM   [ Ignore ]   [ # 132 ]
Moderator
RankRankRankRankRankRankRankRankRankRank
Total Posts:  5551
Joined  2010-06-16

Geez, even a pragmatist in optical illusions.  I kept staring at it, but couldn’t make the non-existent green dot appear.  LOL

Occam

 Signature 

Succinctness, clarity’s core.

Profile
 
 
Posted: 25 October 2012 03:45 PM   [ Ignore ]   [ # 133 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  6166
Joined  2009-02-26
TimB - 25 October 2012 03:21 PM

Is it significant that all of our brains are seeing a green dot?

If anything, it would prove that our brains work very similar, at least in processing colors. We all see the green dot, but evidently we all do have slight differences in how the entire picture is processed in it’s entirety.

 Signature 

Art is the creation of that which evokes an emotional response, leading to thoughts of the noblest kind.
W4U

Profile
 
 
Posted: 25 October 2012 06:48 PM   [ Ignore ]   [ # 134 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  2715
Joined  2011-04-24

What type of sorcery is this? tongue rolleye

 Signature 

Raise your glass if you’re wrong…. in all the right ways.

Profile
 
 
Posted: 25 October 2012 09:51 PM   [ Ignore ]   [ # 135 ]
Sr. Member
Avatar
RankRankRankRankRankRankRankRankRankRank
Total Posts:  6166
Joined  2009-02-26
Occam. - 25 October 2012 03:25 PM

Geez, even a pragmatist in optical illusions.  I kept staring at it, but couldn’t make the non-existent green dot appear.  LOL

Occam

Was the picture moving?  It is a moving gif. There is one empty space, which for me first turns a light violet ghost, and then to green dot circling slowly eating all the red dots like a little pacman, until there is only the circling green dot.

[ Edited: 25 October 2012 09:54 PM by Write4U ]
 Signature 

Art is the creation of that which evokes an emotional response, leading to thoughts of the noblest kind.
W4U

Profile
 
 
   
9 of 10
9
 
‹‹ Zoom into a tooth      Dinosaur Mummy! ››