I got a little carried away and thought about different systems how might it be possible connect into the music circles around the world and came up with installation of heads that see and hear. If you step into the empty slot you will be one of the heads at some other city other side oh earth. You will see, hear and can speak with others. Holographical avatars will be added from simple and quick 2D portrait scan. So you see people standing in circle and talking with each other. You can join.