Creativity is the name of the game. Your entry had me wondering where Empty is until you mentioned the missing piece. Of course, there's a blank space where the missing piece is! And blank means none or empty. Haha you got me there. Great one. Btw I was wondering what this is. It's obviously a mirror but why on both sides? For convenience? So regardless which side you open it there'll be a mirror? I asked my wife because obviously this is a female item. She said that's a mirror with a normal reflection on one side and a magnifying glass on the other. She showed me hers. I didn't know she had one like this too. Women. They do not cease to amaze me.

Best of luck to your entry 👍