Наткнулся на совершенно замечательный текст-размышление на тему календарей: того, как мы их используем и того, как могли бы.

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Once you start to see the calendar as a time machine that covers more than just future plans, you’ll realize that almost any activity could live in your calendar. As long as it has a time dimension, it can be visualized as a native calendar layer.