Nick wrote:I don't see an argument for why it shouldn't be visible.
Okay, I try to explain what I'm talking about. I think we agree, that masks should help thiefs in cities. In my opinion, masks with visible changing won't change it. Why? Because I don't see any adaptation of that kind of mask.
When I put on the mask in one location (outside, building etc.) and I go into other to stole something, everyone would see that.
John is outside. Everyone see event:<b>John put on mask and becoming unnamed masked person</b>. After that <b>unnamed masked person</b> enter the shop and then that <b>unnamed masked person</b> steal something and come out of that building. Now, person who see that theft could come out and easily get to known who that <b>unnamed masked person</b> is. Such action could have only one end.
But if it'll be my version - unvisible mask changing, there could many ends. And I think that I don't have to explain why. And stopped that thief won't be hard, if guards will work quick. Particularly, if it will be some time constraints puted on masks.