OneAvatar is a wearable technology that connects physical body to the digital body of avatars in virtual worlds. Presented for the first time as special project of the Milano in Digitale event, its first implementation connected people's physical bodies to their digital avatar on the virtual world of Second Life. An in-world 3D shooting game allowed visitors to hunt in the virtual world for the digital body of the live performer they had in front of them: when they shot him, the performer felt low voltage electrical shots in corresponding areas of his body. How do our online interactions change when such connections are made? And how do *we* change when our bodies are so tightly connected to our presence in virtual worlds? OneAvatar enacts a radical scenarios to try and approach possible answers. see more material at the OneAvatar website: http://www.artisopensource.net/OneAvatar/