I can't wrap my head around how I2C works with Arduino. I was checking examples and tutorials where two Arduinos are connected using I2C and analog 4 and 5 are connected, as well as ground, like here:http://arduino.cc/en/Tutorial/MasterWriter
Reading multiple tutorials I don't doubt that it works yet it seems to defy logic to connect two analog inputs. How on Earth can anyone send bytes over two connected inputs??? How does the master send anything over an analog input? Thank you for your answers in advance!