(above) untitled (known as 'Floating Tree') by Jerry Uelsmann, 1969
(above) untitled (known as 'The Philosopher's Desk') by Jerry Uelsmann, 1976
(above) untitled, by Jerry Uelsmann, 1997
(above) 'Eclipse' by Jerry Uelsmann, 2011
Combining multiple images using layers in Adobe Photoshop makes
compositing multi-layers considerably easier than Uelsmann's
complex multi-enlarger technique. Here are some examples:
(above) three images by Brooke Shaden
See how Brooke Shaden creates her images: https://www.youtube.com/user/brookeshaden
(above) 'A Place by the Sea' Gary Dixon
(above) 'Dancing on Dreams' by Amelie Berton
(above) 'Heading On Up' by Jamie Sheehy
(above) 'Music at the Edge' by Elena Paraskova
(above) 'Turtle Life" Helen Mim
(above) 'Untitled' by Yasir Quazi