re: mirrors: It's because they don't mirror left-to-right. They mirror front-to-back. Some experimenting with a dry erase marker and a piece of glass will demo

re: mirrors: It's because they don't mirror left-to-right. They mirror front-to-back. Some experimenting with a dry erase marker and a piece of glass will demonstrate this. Write some words on the glass and hold it somewhere in front of the mirror. You'll be able to read the text on the glass and in the mirror simultaneously. The mirror did not flip the text around at all. If instead you write the words on paper it only seems to do this, but notice that between looking at the paper yourself and looking at in the mirror you're doing the flipping of the paper.