I took a glass douwe Egberts coffee jar and put in a letter, a photo, a plumber business card (🤭) and a covid invite letter. I then asked the builder/plumber to put it into the wall in the bathroom. Only the next person to redo the bathroom will find it.

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Time capsule

A time capsule is a historic cache of goods or information, usually intended as a deliberate method of communication with future people, and to help future archaeologists, anthropologists, or historians. The preservation of holy relics dates back for millennia, but the practice of preparing and preserving a collection of everyday artifacts and messages to the future appears to be a more recent practice. Time capsules are sometimes created and buried during celebrations such as a world's fair, a cornerstone laying for a building, or at other ceremonies.

This description uses material from the Wikipedia article on Time capsule and is licensed under the Creative Commons Attribution-ShareAlike License (view authors).