Nice article, thanks for posting it!
Redo the USA (or any country's) motorcycle stamps with the scent of saddle leather!
Or, saddled horses too would smell good.
When I visit places it is always good to remember the smells of food and local scents and odors, like flowers or other things. Similar to sounds and visual cues these trigger an emotional response and memory. Adds to the depth (ahem) of stamp collecting.
Previous threads on scented stamps on Stamp Community:
https://goscf.com/t/22453&SearchTerms=scenthttps://goscf.com/t/16876&SearchTer...ented+stamps