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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.
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>
> 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>
>>
>>
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>> For information about the Association of Science-Technology Centers
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