According to Holiday Insights, today is Compliment Your Mirror Day. Does saying "thank you" to your mirror sound vain? Holiday Insights recommends that you shut your eyes, smile big, then look at yourself in the mirror before asking the question, "Isn't the picture of the person in your mirror absolutely stunning!?"
Wikipedia reports that polished rocks found in Turkey were used as mirrors around 6000 B.C.
A couple of Bible passages mention mirrors. Probably the best known reference comes from the disciple James in his letter to first century believers.
Anyone who listens to the word but does not do what it says is like someone who looks at his face in a mirror. and, after looking at himself, goes away and immediately forgets what he looks like. But whoever looks intently into the perfect law that gives freedom, and continues in it--not forgetting what they have heard, but doing it--they will be blessed in what they do. - James 1:23-25 NIV
In 1 Corinthians 13:12 we find another reference that you might not recognize if you are reading in the King James Translation which says, "For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known."
Many modern Bible translations use the word "mirror" instead of "glass." For example, the English Standard Version read, "For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known."
The next time you look in a mirror, think about how God sees you. Does he approve of your behavior?