Blue is the colour of Mary's celestial cloak; she is the earth covered by the blue tent of the sky. But why should the Mother of God not be mentioned?
According to the dogma she is only beata, not divine. Moreover, she represents the earth, which is also the body and its darkness. That is the reason why she, the all-merciful, has the power of attorney to plead for all sinners, but also why, despite her privileged position (it is not possible for the angels to sin), she has a relationship with the Trinity which is rationally not comprehensible, since it is so close and yet so distant
CW11 ¶ 123As the matrix, the vessel, the earth, she can be interpreted allegorically as the rotundum, which is characterized by the four cardinal points, and hence as the globe with the four quarters, God's footstool, or as the “four-square” Heavenly City, or the “flower of the sea, in which Christ lies hidden”in a word, as a mandala. The mandala, according to the Tantric idea of the lotus, is feminine, and for readily understandable reasons. The lotus is the eternal birthplace of the gods. It corresponds to the Western rose in which the King of Glory sits, often supported by the four evangelists, who correspond to the four quarters
CW11 ¶ 123