On 2/20/2011 10:03 AM, [email protected] wrote:
On 20 Feb 2011 at 8:17, Ken Steele wrote:
I agree with Carol that the illusion is a sophisticated variant
of the Ames room. The basic idea is that one can use the rules
of perspective to produce an image to a static eye (in this case the
camera eye) with specific (but incorrect) size-depth-location
information.
I considered that. But the video shows as background such a typically
cluttered unfinished basement that I thought it entirely believable
as simply a real basement, rather than a cleverly-staged Ames room.
Just look at that mess. It's gotta be real, right? But I will allow
that perhaps the creator of this work was even cleverer than I gave
him credit for (and that's pretty clever for starters).
The suggestion in the diagram is that the tower is not rising
vertically but is actually reclining and receding in space. That
would be a typical approach. Here are some examples--with photos from
the "right" and "wrong" locations.
http://users.skynet.be/J.Beever/pave.htm
Ken--I can't find that there. Did you give us the wrong url?
Stephen
Hi Stephen:
I didn't mean that you would see an example of the Escher Tower
but that you would see examples of manipulating depth cues to
produce mislocation of objects in space.
There are several examples of making an object look like it is
located vertically apart from the background on the Beever
webpage. Look, for example, on the 4th row of the anamorphic
illusions section at the drawing of the woman in the swimming
pool and the earth. Each has a picture from the correct location
to get the effect and then from the side to show how the drawing
was done. Also look at the crawling toddler on the bottom row
and the side-view of the drawing just to the right.
For the record, I don't think the effect was done with CGI. The
tower doesn't look like a vertical piece to me. The clutter in
the background could contribute to the power of the effect. Note
in Beever's pavement drawings that other items in the background
do not interfere with the effect.
I think Mike P is onto something with his note that the path of
the fluid is odd, suggesting that parts of the path are tilted.
Ken
---------------------------------------------------------------
Kenneth M. Steele, Ph.D. [email protected]
Professor
Department of Psychology http://www.psych.appstate.edu
Appalachian State University
Boone, NC 28608
USA
---------------------------------------------------------------
--------------------------------------------
Stephen L. Black, Ph.D.
Professor of Psychology, Emeritus
Bishop's University
Sherbrooke, Quebec, Canada
e-mail: sblack at ubishops.ca
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