Step 1) Open case, (the outter frame swings open from either the left or right)
Step 2) Put your piece of art there
Step 3) Close case
That has been empty since March 29, 2016, the same time I hung the bulletin boards I put that post it in there, and have been waiting ever since for someone to walk by and put something in there. I guess the post it needed to be more persuasive