[visionlist] geometrically ambiguous images

[Todd S. Horowitz]

At 2:46 PM -0500 2/14/06, Laurence Harris wrote:
>http://image.guardian.co.uk/sys-images/Guardian/Pix/gallery/2001/05/30/kapoor.jpg
>
>>  There is a sculpture by Anish Kapoor, exhibited at the Hayward Gallery
>>  in London last decade, which provokes a tri-stable perception.
>>
>>  >From memory, the sculpture is of a large (1m+) smooth greyish
>>  >boulder, with
>>  a roughly hemispherical hole (30cm diameter) excavated into it. The
>>  interior of the hole has been meticulously painted with light-grey
>>  pigments of varying lightness. Three percepts are possible:
>>
>>   As a light-grey painted patch on the boulder's surface
>>   As a translucent window into the boulder's interior, which is lit.
>  >  As a hole.
>  >


Hmm. Looking at the photo on the web, I see a fourth percept: a dark 
gray disk floating in front of the boulder.

Todd

-- 
Todd S. Horowitz, PhD
Instructor in Ophthalmology
Harvard Medical School
Visual Attention Lab
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