these Inca Ocarinas (whistles),
which are shaped like snails, were originally thought (by some) to be toys.
Recently, researchers including anthropologists, archaeologists, musicians,
ethnomusicologists, physicists and others have investigated these ancient
artefacts and now believe them to be sophisticated musical instruments
which are "surprisingly advanced in their construction and tonal qualities".

The quote above is from; http://theocarinanetwork.com/topic/6531096/1/