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Niklas Luhmann is German sociologist. In the following movie, he introduced his card systems “Zettelkasten (= slip box)” that supports his productivity. What is impressive for me, as a PoICer, are, - thinner paper than index cards - larger than 5×3 size, (according to “ Taking Note “, it is A6 size) - seems free format, - seems don’t care the order (more loose than chronological order) This IS extreme case of index cards productivity.
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