An enormity of musical spiderwebs. The instrument has been Developed by Ellen Fullman over the past twenty years or so. As she puts it in the liner notes of her album "Change of Direction" -

"The current instrument has about 100 strings, suspended at waist height for 90 feet. It is played by three people who bow the strings with rosin-coated fingertips, while walking. A C-clamp on each wire is used for tuning, changing the string length much like a capo on a guitar. The instrument is tuned for just intonation, a natural tuning system."