How to Measure Your Reflection in a Mirror

As you move backwards in a mirror, if some one were standing in the same place and looking at your reflection, as you move backwards, it would appear to get smaller. But since your eyes are ing back with you as you retreat from a mirror, your reflection actually never gets smaller. It seems totally counter intuitive, until you start thinking about what's actually happening with the mirror. If you actually reach out and measure it, your reflection of your head is half the size of your real head. Very odd.