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This image is a representation of Jacob's story in the Bible. Jacob, sleeping with his head on a stone, is awaken by the sound of a trumpet. The angels showing him a ladder that will lead him to heaven.
The stone he is sleeping on the Philosopher's Stone, that is, the initial common nature of the student in alchemy. The Philosopher's stone is the subject of the Great Work. The sleeping Jacob is also the common nature of man, because his every day consciousness is like a dream state most of the time.
It is time for you to awaken, to become conscious, thatis, gain clear awareness, of yourself in all your aspects. this process of becoming more and more aware is like a ascending a ladder.