copy of  Turn,  Bridget Riley 1964, by Frank Vollbrecht, Buettgen, 2000

You may view these pictures really threedimensional if you are able to focus both halfs of a picture into one virtual picture by crossing your eyes. Then you will see 3 pictures. With some exercise the picture in the middle can be seen as threedimensional space.

The shape you can see consists in a kind of barrel. As an aid where to look at when crossing your eyes you may use those 2 yellow points. If you are able to focus them into one point then your eyes are best positioned. Now relax your eyes a little bit then you will get the threedimensional shape and you may look at the curvature of the barrel.

As long as you are not very skillfull with this kind of view of stererographic pictures you should better try those fixed pictures which are following on this page than with the animation on the main page. Perhaps you try the black&white picture at the end of this page which seems to be more easy.

 

If you use the animation and you click into a picture you will get changes of colors and some variation of the curvature of the barrel or you will get the sight of a half opaque shape. Nearly every half second single colors may change and also the threedimensional distance of single triangles may differ. Viewing this moving animation threedimensionaly needs quite a lot of exercise. If you position the cursor outside of the picture an automatic sequence will begin. At first the barrel begins to rotate. Examples:

After the rotating sequence hundreds of triangles fill up the curvature. Examples:

After dissolving a lot of triangles you will get horizontal and rhythmic movements from left to right. In a fixed snapshot it is not quite easy to reproduce this movement. On the following snapshot you will get the glimpse of a twisted barrel.

The last parts of this automatic sequence result in shifting triangles outside. Then on the left hand side of the stereographic picture you may see again the original shape of  Bidget Riley's Turn. The right hand side will show different kind of curvatures.

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