So we have this olfactory system. It involves those wonderfully (the good ones), subtle odors that drift through our days and our lives. Our sense of smell of course is dwarfed by bloodhounds, etc.
Likely about 15 years ago I was on a business trip and got on an elevator that was crowded. You remember crowded elevators. Right?
Wafting across that small space was a perfumed scent, that, I hadn’t smelled in about 40 years. It immediately brought to mind a girlfriend from my youth. She and I were never together when she lacked that unique fragrance.
And as you’d suspect part of our neurological hardware finds aromas closely tied to our memories. “The sense of smell is closely linked with memory, probably more so than any of our other senses. Those with full olfactory function may be able to think of smells that evoke particular memories; the scent of an orchard in blossom conjuring up recollections of a childhood picnic, for example.” (https://www.fifthsense.org.uk/psychology-and-smell/)
Complicated creatures. Aren’t we?
Pilgrim on a Long, Long Journey 
Smell is the most memory producing sense for most of us. I think about that often as I read about the COVID “long haulers” who still have no sense of smell. They have lost not only taste but connection to their memories of the past!
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