====== Tratado 29 (IV, 5) - Psychological Questions — III. About the Process of Vision and Hearing. (Guthrie) ======




**FOURTH ENNEAD, BOOK FIVE.**
**Psychological Questions — III. About the Process of Vision and Hearing.**

**IT IS UNCERTAIN WHETHER AN INTERMEDIARY BODY BE IMPLIED BY VISION.**

**REFUTATION OF ARISTOTLE'S INSISTENCE ON A MEDIUM OF SIGHT.**

**THOUGH THE MEDIUM EXPERIENCE AFFECTION, THE ORGANS FEEL IT BETTER WITHOUT THE MEDIUM.**

**NECESSITY OF A MEDIUM IN THE THEORIES OF VARIOUS PHILOSOPHERS.**

**A COSMOLOGICAL MEDIUM IS NECESSARY, BUT IT AFFECTS SIGHT ONLY ACCIDENTALLY.**

**IMAGES DO NOT REACH US BY EFFLUENCE.**

**USELESSNESS OF AIR AS TRANSMITTING MEDIUM PROVED FROM SIGHT OF OBJECTS AT NIGHT.**

**ABSENCE OF MEDIUM WOULD INTERFERE WITH VISION ONLY BY DESTROYING SYMPATHY.**

**VISION IS NOT DEPENDENT ON THE AFFECTION OF THE MEDIUM.**

**MUTUAL RELATION OF THE EYE'S LIGHT AND THE OBJECTIVE LIGHT.**

**INTERMEDIARY LIGHT IS UNNECESSARY. PARTLY BEING AN OBSTACLE.**

**NOT EVEN THE LIGHT OF THE EYE IS TO BE CONSIDERED AS MEDIUM.**

**THE OBJECTIVE LIGHT DOES NOT TRANSMIT THE IMAGE BY RELAYS.**

**NEITHER FOR HEARING IS THE AIR NECESSARY AS A MEDIUM.**

**THE RELATION OF THE AIR TO THE LIGHT.**

**DOES THE WITHDRAWAL OF THE LUMINOUS SOURCE ABANDON THE LIGHT TO DESTRUCTION; OR DOES THE LIGHT FOLLOW IT?**

**LIGHT AS ACTUALIZATION IS THE BEING OF THE LUMINOUS BODY, AND IS INCORPOREAL.**

**LIFE AND LIGHT DO NOT PERISH. BUT ARE NO MORE THERE.**

**A WORLD OUTSIDE OF OUR WORLD WOULD NOT BE VISIBLE.**

**SENSATION IS LIMITED TO COMMON INTEGRAL PARTS OF THE UNIVERSE.**