Maybe a slightly different view on the subject: There are people who do this kind of photo-transformations ('3D photos' like Michel's and Ray's) professionally, in real life. I used to do a fair and regular share of these transformations in my graphic design work... And I have to say that I have never considered it as being a part of photography. For me it was just a part of the graphic work, taking existing images (mine or other's) and transforming them (for reasons of layout or page embellishment). So, even though I don't really care in which category those images are posted, I personally feel that it has nothing to do with photography, I don't look at it as photographic work, and I even find that in some cases it takes away from the eventual photographic value that the image could contain. The result is that I usually don't even look at those images, when they're posted in the photography gallery... so maybe the images would actually benefit from being given a separate category... where we can value them for what they are: graphic image transformations...

We do not see things as they are. ǝɹɐ ǝʍ sɐ sƃuıɥʇ ǝǝs ǝʍ