Removable hanging device

A removable hanging device for use with a structure having at least one square opening formed therein, the removable hanging device comprising:

• a retaining element configured to be received in the at least one square opening of the structure, the retaining element including a substantially square cross-section as the retaining element extends from a rear face thereof to a front face thereof;
• a hanger body including a rear face;
• and
• a shaft connecting the front face of the retaining element to the rear face of the hanger body, wherein the shaft has a substantially rectangular cross-section as the shaft extends from the front face of the retaining element to the rear face of the hanger body, the shaft including a channel formed therein extending from a first side surface of the shaft to a second side surface of the shaft and formed adjacent to a third side surface and a fourth side surface of the shaft causing the shaft to include a first portion between the channel and the third side surface and a second portion between the channel and the fourth side surface.