In this process of cartography of manifested world conscious beings acquire the knowledge of laws, rules of labyrinth’s construction. Knowledge gives power, the power to correlate oneself with the world. It gives birth to illusion of power.
A black square placed on the background of other image may symbolize our world, illusory world born for percepting consciousness and unfolded on the background of forgotten and hidden reality about which we may guess only thanks to echoes of our the most deepest dreams and insights. Boundary posts are the symbol of what is emphasized by good known phrase "Don’t cross the borders defined for yourself". All acquired power and understanding remain within limits of Great Illusion.
This is The Case of Pandora bestowing the illusion of having power over Illusion.