Can't figure out how to get the Macedonian Armor. Any ideas?

I am at a total loss here too. When you put a piece of the wall back into place a hole opens up on the column underneath it but nothing I have fits into it. I have a mirror, Key and some sort of blob that is used to do light tricks. none of them fit.

Just stumbled onto the solution. At the bottom right of the door is a heiroglyph that matches the one on the mirror. It should all fall into place from there.

Thank you, Scott and John. Scott, it is good to know I'm not the only one. John, your hint got me through it.