Camera Obscura is the essence of all photography.
While in school, I decided to try and document the process of making one doing a long exposure to capture the image.
To achieve this, I got inside an abandoned dorm that had a window facing the top of the clocktower. I completely blacked out the window with trash bags then cut a whole and taped a washer to the window. This created an upside-down image on the wall behind me of the clocktower outside the window. I documented this process in the time-lapse video below.