Forrest Wickman reports that you’ve got plenty of space in your brain and it uses very little energy very efficiently. It stores all kinds of “data”, memories, feelings, facts and so on. Before storing, it has to process the data, as in recording it, deciding where to store it and importantly, deciding in cahoots with other parts of the brain to decide when and what to retrieve.
There may be just be too many places for keys. For right handed men, like the right pocket of the last pair of pants worn. Maybe left in the door after juggling too much when entering. Maybe thrown into trash while holding trash and keys in same hand.
An elder once said, “everything must have a place and everything must be in it’s place.” Unstated in that quote was the requirement that everything in it’s place has been maintained in good working order before storing, like cleaning and oiling spades and shovels after use in the dirt.
The brain must do those kinds of things for us autonomically although this was overheard in a crowd; “I have to forget something to make room for something new.” Tech truisms include computer hard drives crash, files get corrupted, memory has to be added for the next wave of programs.
Never to be forgotten – the round ones might contain marzipan. Chocolate covered cherries are usually in their own box.