It's fairly obvious when you think about it. We tend to see a display with lights and buttons as some form of 'streaming media', due to our familiarity with the television and the cinema. But a human voice, even if it emerges from a screen, seems to have an 'interactive quality' to it. It invites us into a conversation, our minds involuntarily shift into a very different mode: we sense an emotional connection with the voice, and consequently, from the device it comes from. We tend to make snap judgments about the 'speaker', his or her gender, or age, or even cultural or racial background. From hearing a single sentence the user could even make some assumption of the speaker's 'personality' - is she or he calm or aggressive, focussed or confused, open minded or not. And with a couple of conversational exchanges with a voice interface, this sense of the speaker's personality extends towards something 'human' or 'alive'. Some of us might even sense the political orientation of the speaker in time.