This is the study and appreciation of stamps. It may involve learning about postal history, such as the artistic and technical aspects of postage stamp production. Curating philatelic products (i.e., stamps, post cards, postal stationary, or covers) into a collection is an activity that can be a wonderful learning experience. For an individual interested in building a collection, organization is key. Collections can be based on country of origin. But, many people develop topical collections. There are collections based on a theme, like space exploration. Stamps commemorate many things, events, activities, and people. Topical collections are built around themes, like sports, animals, music, or flowers. Also, other philatelic items, such as postal stationery, stamped envelopes, and even postmarks, can tell the story of your favorite topic.