Another whole new challenge-the scent of a memory. This is such an interesting topic.
Honestly collecting and keeping record of a sense of smell are not my custom. However I can recall my past. When I visited a perfume company in France the first time, my body was covered with sweet smell; I hopped in a cab with smell of cigarettes; a smell of sewage after floods, etc.
I would not like to make the sense of smell drab through this 4th challenge because orientals often say a masterwork contains nice, tasty, and frensh; just like a sweet dessert.