Here are some multiple-exposure images to show sculptures that can't be constructed, and to get some sense of the visual dynamics of objects moving in 3-space.
I tried to figure out how to configure the camera, the movement of the object, and the background.

First, some indoor experiments of moving the camera (rather than the object) over an old painting of mine (London Dance Geometry, 1970).
Multiple exposures produce multiplicity of elements at different value levels, a much richer and more subtle texture than the original painting.
This image, however, is smooth; it is a flat. The real painting, however, has a surface, a texture, and a depth from the stretched canvas--
for the real painting exists in 3-space.

OK, now let's go outdoors to photograph changing states of a 3D object (a new stainless piece).
The camera is on a fixed tripod mount. I missed a retrospectively obvious point, however,
for the unchanging background strongly comes forward because it is repeatedly photographed in the multiple exposure,
whereas the piece is photographed only once in each of its changing positions!
Thus the knots in the background wood turn into eyes peering onto the changing scene. Oops.

Let's try a better background and put the piece up against the sky.
Now, fortuitously, the sky comes forward into the multiple images of the piece,
creating this eerie and wonderful scene of a sculpture that can't be built.

-- Edward Tufte