Postage stamps tell stories. They are indicators and waymarks of time and place. Stamps may be diminutive, but colorful and well designed, they are cultural icons often sending messages more significant than the envelope’s contents. Among the most widely seen works of art, they circulate through every home and business. Stamps are among “the silent ambassadors on national taste,” Irish poet and playwright W. B. Yeats told his country’s senate almost 90 years ago.