P3D Re: time and 4d

["David Lee" <koganlee@xxxxxxxxxxxxx>]

----- Original Message -----
From: Tom Trombley <tatrom@xxxxxxxx>
To: Multiple recipients of list PHOTO-3D <photo-3d@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, March 08, 2000 10:37 PM
Subject: P3D Re: time and 4d


> >From: John W Roberts
>
> >The 2D "impossible images" take advantages of the fact that there's only
> >one view, in order to fool the human perceptual system in an interesting
> >way. So - can anyone think of stereo (2-view) images that take advantage
> >of the fact that there are only two views, to fool the human perceptual
> >system in interesting ways?
>
> A photograph is a frozen moment in time. A stereograph is a frozen moment
> in time but it doesn't have to be. Because it is two photographs and they
> can differ. Fritz M. Brown (digest 3761) noted the movement of clouds
> changed their position relative to a prison (escape is possible).
Spacetime
> opens up with the fusion of the two images and produces dislocations
> perpendicular to the picture plane.
>
> Vincent Chan (digest 3760) noted waving flags (give) the impression of
> movement.
> This is the action of retinal rivalry creating a two frame animation loop.
>
> Here is a 4th dimensional field to play in. For the sake of argument your
> could say that trick stereographs work because of the flexiblity of the
4th
> dimensional tying of knots in space, no strings attached.
>
> Tom
>
>

It is worth noting, since Tom wouldn't have mentioned it himself, that Tom
Trombley has created a number of exceptional stereo cards based on the
concept of moving an element in the image between the left and right
exposures. Some of them have light sources (and consequently shadows)
moving, some have objects moving, and others have other surprises. I had the
pleasure of having several of Tom's images in an exhibition of contemporary
stereographers that I put together for a gallery in Sacramento in 1996.

David Lee