This is all four of Rudolf Steiner's lectures collected in "Occult Signs & Symbols", given in September 1907.
Part 1: The Creative Cosmic Tone. Flooding Color and the Formative Forces of Akasha.
Part 2: The Symbolic Meaning of Noah's Ark and the Gothic Churches.
Part 3: The Symbolism of Numbers.
Part 4: Man, the Most Significant Symbol.
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