I have just skimmed through www.fredericksommer.org, arguably too fast to do the guy justice. I did not personally find any images I would want to call "sick," perhaps some people would take objection to the severed chicken head. I did notice a commendable willingness to push out the limits of the medium, for example creating "negatives" by non-photographic means such as painting, etc., photographing cut paper, use of sharpness and out-of-focus effects. Equally, I found nothing that really gripped me and stopped me in my tracks.