Tape poetry. This caught my eye as I was walking home. Poetry written out on tape and stuck on a pipe.

Listen to me as one listens to the rain
Without listening, hear what I say
With eyes open inward, asleep
With all five senses awake
It's raining, light footsteps, a murmur of
air and water, words with no weight
- Octavio Paz


Update: http://www.tapepoetry.com