This huge banner giving info of the seven chakra intrigued me:
Sri Ramakrishna talks at length in The Gospel on His "very secret experience": (page 830, middle)
"A man's spiritual consciousness is not awakened unless his kundalini is aroused.
"The kundalini dwells in the Muladhara. Then it is aroused, it passes along the Sushumna nerve, goes through the centres of Svadhisthana, Manipura, and so on, and at last reaches the head. This is called the movement of Mahāvāyu, the Spiritual Current. It culminates in samādhi.
"One's spiritual consciousness is not awakened by the mere reading of books. One should also pray to God. The kundalini is aroused if the aspirant feels restless for God. To talk of knowledge from mere study and hearsay! What will that accomplish?
"Just before my attaning this state of mind, it had been revealed to me how the kundalini is aroused, how the lotuses of the different centres blossom forth, and how all this culminates in samādhi. This is a very secret experience. I saw a boy twenty-two or twenty-three years old, exactly resembling me, enter the Sushumna nerve and commune with the lotuses touching them with his tongue. He began with the centre at the anus and passed through the centres at the sexual organ, naval, and so on. The different lotuses of those centres-four-petalled, six-petalled, ten-petalled, and so forth-had been drooping at his touch they stood erect.
"When he reached the heart-I distinctly remember it-and communed with the lotuses there, touching it with his tongue, the twelve-petalled lotus, which was hanging head down, stood erect and open its petals. Then he came to the sixteen-petalled lotus in the throat and two petalled lotus in the forehead. And last of all, the thousand-petalled lotus in the head blossomed. Since then I have been in this state."