The suite of 12 original printed typewriter poems by Chopin utilizes one letter each to represent the first letter of Ruth Ruth Marvin Marvin Sackner Sackner Concrete Concrete Visual Visual Poetry Poetry. Large letters in these poems appear to be sikscreen additions. In the book, there is a a usual Chopin typewriter poem reproduced for each letter, number, and signed on the keyboard. Paul Zumthor contributed a handwritten poem. -- Source of annotation: Marvin or Ruth Sackner.