Hello! This project is a pinhole camera. It is using photographic paper (Ilford Ilfospeed Grade 3) as the film. The paper must be cut to 8.9 x 8.9 cm.
The hole in the main body is to be covered with cardboard (or with a similar material), which must be pierced with a needle (or something similar, again).
The design can be modified: making the box longer causes an increase in the "focal distance". Making it shorter causes the "focal distance" to be shortened.
The corners of the body (where the cap fits) should be sanded so that the cap fits perfectly.
The blue part acts as a shutter. You need to manually move it to let light pass in.
With this method exposure times are quite long. Darker scenes may need more than 6 minutes. Brighter scenes are about 2-3 min.
You must take into account that the photographing paper is providing negative images. The photos you're seeing have been edited.