My photos of human activities and the natural environment are classified like books in a library.
A. General Works
B. Philosophy and Religion
C. History and Geography
D. Social Sciences and Industry
E. Science and Technology
F. Art, Literature, and Other
![This image has an empty alt attribute; its file name is camera-1-1024x560.jpg](https://koichiro.org/wp-content/uploads/2020/06/camera-1-1024x560.jpg)