Camera Obscura was for me like magic, the idea that any kind of object can be transferred to a camera and make photos was crazy.
I like that way of working, using just simple materials and a lot of imagination. There is no mechanical device involved in the process. 
At first I constructed wooden square or rectangular boxes in different sizes as my pinhole cameras. Working indoors using artificial light and natural window light, the exposure time was between a few minutes to almost one hour long. Later I discovered the cylindrical cans which gave me a new "form" of lines.