at each point of the compass, the way is blocked by a threshold guardian: Blue Sands Boy, Red Sands Boy, Black Sands Boy, and White Sands Boy. They flatter and cajole their way past these ogres
Campbell provides his most explicit nomenclature for the threshold guardian, identifying cardinal-point guardians who must be bypassed through wit before the hero can enter the realm beyond the known world.
, Pathways to Bliss: Mythology and Personal Transformation, 2004thesis