Yogamaya

GOVINDA: "What is the meaning of 'yogamaya'?" 

MASTER: "It signifies the yoga, or union, of Purusha and Prakriti. Whatever you perceive in the universe is the outcome of this union. 

Take the image of Śiva and Kāli. Kāli stands on the bosom of Śiva; Śiva lies under Her feet like a corpse; Kāli looks at Śiva. All this denotes the union of Purusha and Prakriti. Purusha is inactive; therefore Śiva lies on the ground like a corpse. Prakriti performs all Her activities in conjunction with Purusha. Thus She creates, preserves, and destroys. That is also the meaning of the conjoined images of Radha and Krishna. On account of that union, again, the images are slightly inclined toward each other. 

To denote this union, Sri Krishna wears a pearl in His nose, Radha a blue stone in hers. Radha has a fair complexion, bright as the pearl. Sri Krishna's is blue. For this reason Radha wears the blue stone. Further, Krishna's apparel is yellow, and Radha's blue. 

- Gospel of Sri Ramakrishna, P 271 

                      (22 July 1883)