[songeater]

or use a nikon f2 camera and double expose...

https://yorsad.blogspot.com/1984/12/xx.html

[teenbear]

The intent appears to be the manipulation of the physical space at the time of capture. A double exposure of your subject and then a second exposure of the dove or other image would be no better than photoshopping the image after

[Doxin]

The intent is to modify photos other people are making. The artist has no control over the camera taking the picture in this artwork.