I can see clearly in the dark...
Camera Obscura (Room Dark)
Is Latin for dark room (Camera = Room, Obscura = Dark) and this division is not so much about simply taking a photograph, but more about creating a print using photographic process's in the dark room.
Some are simply Photograms ( ), some are contact prints ( ) made from from drawings or scanned and printed photographs on acetate sheet to create my own negative transparency, some are made from using light sensitive chemicals like Cyanotypes and "Liquid Light" ( ) while others are similar in many ways to the traditional "Black and White" print but using more exotic light sensitive materials such as Platinum ( )