A frame apparatus for displaying a flat article and a combined frame apparatus and flat article. In one aspect, the frame apparatus includes a display frame defining a rabbet, a stack positioned in the rabbet, and a spacer apparatus. The rabbet is defined by a floor and a wall. The wall includes an engagement feature which may be a channel. The spacer apparatus is configured to be positioned in the rabbet and engagement features thereof extend into the channel in the wall of the rabbet to couple the spacer apparatus to the display frame. The spacer assembly may also be in contact with the stack to hold the stack in the rabbet.