Mémoire morte
I found this guide on the Arduino's website on how to write data to the ROM ie. flash memory. This data can be retrieved even if you cut the current.
This is because I'm thinking about a system that is able to learn, that has souvenirs. However, I'm thinking that since the system is also autosufficient and autoregulated wrt its energy that maybe it would be fun if there was not such a long-term memory. It would be a bit like if, when you die, your memory is erased? So if you take care of this object you have to make sure it doesn't lose its energy. Then the object could also be destructive in some circumstances?