But there are people who still thinks that mirror shows side ways around. Where does that come from?
Probably this is the psycological explanation. Although I haven't read the actual paper introduced in this article, I'll show my point of view. The important fact about this issue is that human being is made almost symmetry in horizontal ways and absolutely not in vertical way. This makes us to misunderstanding in the direction.
Stand in front of the mirror and put your right hand up. The figure in the mirror looks as if he is putting his left hand. But think of it. The hand of the figure in the mirror is definitely your right hand and it is reflecting at the right side of your body.
Why do you think it is your left hand? You are seeing from as if you are in inside of the mirror. Since our body is horaizontaly symmetry, it almost makes sense if you take it as if the figure in the mirror switched his right and left side and turned 180 degrees around. But ofcource there isn't any person standing in the other side of the mirror. It's not a fairy tale. The most surprising part of this mystery is that this still is a mystery. Hasn't it been solved?