Hobbies:

Whilst some hobbies strike many people as trivial or boring, hobbyists have found something compelling and entertaining about them. Much early scientific research was, in effect, a hobby of the wealthy; more recently.A hobby may not be as trivial as it appears at a time when it has relatively few followers.
The anecdote indicates that at the time an interest in nature was not widely perceived as a credible hobby. Practitioners of that hobby went on to become the germs of the conservation movement that flourished in Britain from 1965 onwards and became a global political movement within a generation. Conversely, the hobby of aircraft spotting probably originated as part of a serious activity designed to detect arriving waves of enemy aircraft entering English airspace during World War II. In peacetime it usually has no such practical or social purpose.
The hobby of collecting consists of acquiring specific items based on a particular interest of the collector. These collections of things are often highly organized, carefully catalogued, and attractively displayed. Since collecting depends on the interests of the individual collector, it may deal with almost any subject. The depth and breadth of the collection may also vary. Some collectors choose to focus on a specific subtopic within their area of general interest: Some collections are capable of being completed, at least to the extent of owning one sample of each possible item in the collection .Collectors who specifically try to assemble complete collections in this way are sometimes called completists. Upon completing a particular collection, they may stop collecting, expand the collection to include related items, or begin an entirely new collection. The most popular fields in collecting have specialized commercial dealers that trade in the items being collected, as well as related accessories. Many of these dealers started as collectors themselves, and then turned their hobby into a profession. There are some limitations on collecting, however.