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It is pleasing and a little sad, in the way all memory is, to shuffle through a set of transit passes from different cities. Every city holds a spectrum of memories, and each of these little objects compresses that spectrum down to a tangible, pocket sized memento.
@graydon I kept all of my "disposable" Pasmo and Metrocards...pull them out occasionally. Have reusables from a dozen cities, too. So very many memories.