Innin and Yonin: The Yin and Yang of the Ninja

The ninja had two modes of operation: Innin and Yonin. Innin covered assassinations, sabotage and other covert operations requiring stealth, while Yonin covered operations performed in the open that required cunning. We'll examine the two using reenactments and also reconstruct a "saotokikigane" to determine the truth about this obscure listening device.