In this age of texts and e-mails, why not depart from the norm and send a handwritten missive franked with a fantastic work of art?

On March 26, the U.S. Postal Service releases five stamps celebrating the acclaimed Mexican-American outsider artist Martín Ramírez (1895–1963).

Confined to mental institutions for decades, Ramírez, a former railroad worker diagnosed with schizophrenia, created finely crafted drawings, collages, and multimedia paintings distinguished by biographical symbols—train tracks and the like—as well as religious iconography, architectural structures, and a delicate sense of color.