Peruvian "whistling jars"

 

The video is a study of the physics and fluid dynamics of a modern "whistling jar."  What amazes me is that the concepts involved here date back to pre-contact Mesoamerica.   Here is a whistling jar from the Metropolitan Museum of Art:

Whistling jar with seated man wearing a headdress [circa 1000-1476]

Although numerous pottery instruments survive from pre-Conquest South and Central America, little is known of how they were used before Spanish invaders ravaged the native cultures. Whistles, trumpets and rattles in animal or human form probably had ceremonial functions or served as playthings. The "whistling jar" is a 1- or 2-chambered vessel in which a whistle, often concealed by a bird's head, is sounded by blowing into the spout, or by pouring liquid from one chamber to the other to create a bird-like twittering sound. Smaller whistles in animal shapes, perhaps worn suspended from the neck, sometimes have fingerholes that allow variation of pitch.

With a tip of the blogging hat to Neatorama.