the next artist to consider is man ray...
he developed the rayographs, the... ok i just had the biggest mental blank! not that u could tell but it's ok! anyway, man ray created a whole lot of strange artworks, some were simple photos manipulated to some relevance or another, must say i didnt understand a whole lot of his works, but his rayographs are very dada aswell, to tie this in with your question he was influenced by marcel duchamp, salvador dali, picasso and heaps of others, and from their influence he started creating his own works to bring his rayographs as something new to the table... hope that made sence.