When I first started collecting postcards, I concentrated on views of different countries. I had no idea at the time that so many other types might be available. I "discovered" spices very late in my collecting career, and I wish I had started much earlier..
I approached this spicy theme via food. It's often hard to separate one theme from another.
I was a bit short of ideas for the letter S, The seaside might have been nice, or ships, or snow.