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You have to see this lovely and wonderfully illustrated post on the blog Poemas del río Wang on the now-vanished delicate art of stamp placement. Depending on how you placed a stamp on an envelope, it told an informed recipient you sent a kiss, you were thinking of them — or (sadly) that you were not free. Fascinating — and something it would be charming to revive for Valentine's Day, I think.
(untitled painting by Raimundo de Madrazo y Garreta {1841-1920} via poemas del río wang)