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Subject:
Re: Very neat illusion
From:
Eric Siegel <[log in to unmask]>
Reply To:
Informal Science Education Network <[log in to unmask]>
Date:
Mon, 7 Jul 2008 07:03:30 -0400
Content-Type:
text/plain
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

Maybe the after image effect is amplified or sustained a bit longer by  
the expectation that the sky will be blue?  But the after image did  
fade, particularly if I moved my eyes, I could see the blue sky  
"patch" misregistered on the picture and then fade over a period of  
about 3-4 seconds.

Eric Siegel
esiegel at nyscience dot org




On Jul 6, 2008, at 10:03 PM, Chuck Howarth wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> *****************************************************************************
>
> An after image?  Yes, but...  It seems to me that there is something  
> else going on here.  The standard after-image effects last for  
> several seconds and slowly fade away.  The effect Dennis found seems  
> different:  the image appears colored, and continues to appear  
> colored for quite a while as long as you continue to look at the  
> dot.  But turn your gaze to the side, and it reverts to black and  
> white.  If you then look back at the dot, the color does not  
> reappear, as it would with most other after-image effects.   So I  
> think you guys got some more explaining to do.....
>
> Chuck Howarth
> Gyroscope, Inc.
> 283 Fourth Street, Suite 201
> Oakland, CA  94607
> [log in to unmask]
> 510-986-0111
>
>
>
> On Jul 6, 2008, at 5:43 PM, Eric Yuan wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology  
>> Centers
>> Incorporated, a worldwide network of science museums and related  
>> institutions.
>> *****************************************************************************
>>
>> I'm curious whether the afterimage effect plays a role in enhancing  
>> vision,
>> such as detecting motion, or widening our effective field of vision  
>> when we
>> scan our surroundings?  Maybe straightening out our vision during a  
>> bumpy
>> car ride?
>>
>> -Eric
>>
>>
>> -----Original Message-----
>> From: Informal Science Education Network
>> [mailto:[log in to unmask]] On Behalf Of Paul Koenig
>> Sent: Sunday, July 06, 2008 8:11 PM
>> To: [log in to unmask]
>> Subject: Re: [ISEN] Very neat illusion
>>
>> ISEN-ASTC-L is a service of the Association of Science-Technology  
>> Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>> ****************************************************************************
>> *
>>
>> It's an afterimage in the eye. I know the Exploratorium has a few
>> exhibits/activities based on the same thing. Here's what I found  
>> after
>> a quick search for more explanation:
>> http://www.exploratorium.edu/snacks/bird_in_cage/index.html
>> http://www.exploratorium.edu/snacks/afterimage/index.html
>>
>> It's an effect I know all too well after spending a lot of time with
>> anaglyph glasses.
>>
>> - Paul Koenig
>>
>> On Jul 6, 2008, at 4:50 PM, [log in to unmask] wrote:
>>
>>> ISEN-ASTC-L is a service of the Association of Science-Technology
>>> Centers
>>> Incorporated, a worldwide network of science museums and related
>>> institutions.
>>>
>> ****************************************************************************
>> *
>>>
>>> Dear all,
>>>
>>>
>>>
>>> My son sent me an optical illusion unlike any I've seen before.  I
>>> thought you would enjoy it.  Does anyone know what is happening in  
>>> the
>>> eye/brain to make this work?
>>>
>>>
>>>
>>> http://www.johnsadowski.com/big_spanish_castle.php
>>>
>>>
>>>
>>> Dennis
>>>
>>> "Work hard to find something that fascinates you. When you find it  
>>> you
>>> will know your lifework" -- Richard Feynman
>>>
>>> Dennis Schatz
>>>
>>> Senior Vice President for Strategic Programs
>>>
>>> Pacific Science Center
>>>
>>> 200 Second Ave. No.
>>>
>>> Seattle, WA 98109
>>>
>>> Phone - 206-443-2867
>>>
>>> Fax - 206-443-3631
>>>
>>> www.dennisschatz.org <http://www.dennisschatz.org>
>>>
>>>
>>> ***********************************************************************
>>> For information about the Association of Science-Technology Centers
>>> and the Informal Science Education Network please visit  
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>>>
>>> Check out the latest case studies and reviews on ExhibitFiles at
>> www.exhibitfiles.org
>>> .
>>>
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>> ***********************************************************************
>> For information about the Association of Science-Technology Centers  
>> and the
>> Informal Science Education Network please visit www.astc.org.
>>
>> Check out the latest case studies and reviews on ExhibitFiles at
>> www.exhibitfiles.org.
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>> ***********************************************************************
>> For information about the Association of Science-Technology Centers  
>> and the Informal Science Education Network please visit www.astc.org.
>>
>> Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org 
>> .
>>
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>
>
>
>
>
>
> ***********************************************************************
> For information about the Association of Science-Technology Centers  
> and the Informal Science Education Network please visit www.astc.org.
>
> Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org 
> .
>
> The ISEN-ASTC-L email list is powered by LISTSERVR software from L- 
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