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Besides philately, there are numerous other ways to keep the past alive. Collecting historical artefacts, paintings and statues in a museum, collecting and reading books, collecting stamps, first day covers, etc. are all a few ways of revisiting history.
Fond memories of the past are often kept alive through photographic collections, letters, etc. Man seeks refuge in the nostalgic memories, the happier times of the past. He transports himself to the world by travelling through time to escape the present. In fact, he is constantly moving between past for escape, and present and future.
This capacity to oscillate between the past, present and future is a great intellectual gift. This human tendency enables him to plan for the future in the present by reaping benefits from the past. Such a tendency helps in ensuring acceptance of the impact of important decisions taken at any point of time and learning from them.