scene
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"Uneasy Center", the original from Bridget Riley contains
strong visual
elements, which lead to three-dimensional impressions. This had been
the
source for a technical study to try and experiment with stereographic
features
and movements.
The result is something like a short stereo movie, where the
real spatial
effects can only be seen, when crossing the eyes. You may even get
three-dimensional
impressions with the normal view, but these effects are quite different
from those stereo effects.
The small pictures on this side are not
good qualified
for stereographic effects.
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| typical examples
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Without using the mouse you may watch 6 sequences with slow
construction
and destruction of conical figures. These figures look like the
examples
on the left hand side. Viewing these figures using the stereo effect by
crossing the eyes will change heights in deeps and vice versa (Upside
down).
Points which seem to be at the top with normal viewing will be seen in
the background with stereo viewing (Upside down). Both figures overlay
to only one spatial figure with stereo viewing. Depending on
the
actual scene the top of this spatial figure will sometime be in front
of
you and sometime in the background.
There are some sequences in the movie where the stereo effect
will collapse.
Then the eyes are forced to switch between front and back (Upside down)
because of the construction process, when it will result in non
existing
three-dimensional figures (for example the picture in the middle). This
effect may only be seen using stereo viewing.
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changing up and down
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The change of sequences is introduced by a slow motion where
the right
hand figure is reconstructed. Segments are slowly moved so that the
eyes
can follow the change between up and down or back and forth (Upside
down). |
mouse interaction
 |
After crossing the border of the frame twice with the mouse
you will
activate a new sequence where the figures begin to move inside the
frame
depending on position ot the mouse. The program allows again to produce
illegal figures which collapse while viewing the stereo effect. At such
moments the eyes are again forced to switch between up and down (Upside
down). |
mouseclicks
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You may deactivate the mouse interaction with a mouseclick.
Then a
short sequence is produced which deconstructs the last figure before
the
normal standard sequences will start again.. The deconstruction varies
depending on the position of the top of the figure (see examples on
left
hand side).
With normal viewing you will see typical optical art with flat
pictures
which seem to be three-dimensional. While viewing with crossed eyes you
will watch a spatial figure coming out of the screen.
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| For practicing the stereo view a steady picture will be more
fit and
easier:
The picture shows the smallest gray circle as the top of a
cone in front
of the screen.
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Picture for practicing
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