(TrendHunter.com) The OCTAV is a one-off musical instrument made from PVC pipes. The wearable tubular music-maker is designed by Asaf Wainberg. Resembling a similar invention called the Tubulum, the OCTAV's... (TrendHunter.com) The OCTAV is a one-off musical instrument made from PVC pipes. The wearable tubular music-maker is designed by Asaf Wainberg. Resembling a similar invention called the Tubulum, the OCTAV's...