The Waterphone is the invention of one Richard Waters, who combined aspects of the “Tibetan water drum, African kalimba and 16th century nail violin,” to create a unique and bewitching instrument. The Waterphone’s morphing tonal character is caused by water moving inside the instrument’s highly resonant metal frame. You might recall that cool glooping sound a pot full of water makes when you knock its metal side and tilt the water level; this is the same principal. Though a Waterphone will set you back a cool US$1,100, buying the genuine article direct from its inventor beats supporting cheap knock-off artists. Find out more about the Waterphone here.