Music for the Tree of Life

for a billion years
on the Tree of Life
our ancestors' hearts have been beating

which we can visualise, graphically
as stripes on the Tree
of black and white

closer when the heart beats quickly
wider when it slows

(feel your pulse, now

picture your branch
beating
as it grows)

heartrates as if measured
by a sensor-electrode
listening to your heart

but there's a richer music
to your mood

as if the sensor were moved
from your heartbeat
to your neurons' moody rhythms

tense or relaxed
expansive or introverted

braincells like studio stars
watching the movie of your life
and improvising a soundtrack

and you might move your sensor
anywhere on the Tree
and tap the music there