So here’s an interesting question for you: could you drive your car if  it didn’t have any mirrors. I’m thinking that the answer would be yes,  but boy-o-boy would we all be nervous as we first backed up, and then  headed off down the road. We’d have no idea what was behind us or what  might be passing us on either side. 

Driving would turn into a bit of a  nightmare. Now we all do have mirrors on our cars and that’s a good  thing. However, it turns out that those mirrors are not perfect – we can still have blind spots where things (cars, people, bikes, etc.) can exist and we can’t see them. This can be a big deal. 

Is it possible that when we are giving a speech we may also have blind spots that we don’t know about?