We were talking about where a person is allowed to pray. We spoke about not praying on an elevated plane because we're afraid you're going to fall. It takes away from your kavanah (intention), and it's also considered arrogance.
Today the question is: What are you not allowed to pray opposite, and what are you not allowed to face when you pray? The classic halacha (Jewish law) is that a person should avoid facing a picture. The Mishnah Berurah brings this; the Shulhan Aruch actually brings it. Looking at a colorful picture is going to distract you, so you should avoid facing one.
The Mishnah Berurah adds that a person should avoid praying in front of a mirror. Why? Because, along with the issue of distraction, there's an additional issue: it looks like you're praying to yourself. The difference is that if you close your eyes while praying in front of a picture, technically speaking, you're fine because there's no issue of distraction. So you're good. When you're praying in front of a mirror, even if you were to close your eyes, it's still an issue because it still seems like you're praying to yourself, and you're seeing yourself. Therefore, the halacha is that a person should avoid praying in front of anything that has a reflection, which means a mirror, or even a window if it has a certain reflection at a certain time during the day, because we do not want either of those two things: distraction or the appearance of looking as if you're praying to yourself.
Have a great day, Kabbalah.