Lastly, It is no wonder that this Quincunciall order was first and still affected as gratefull unto the Eye: For all things are seen Quincuncially; For at the eye the Pyramidal rayes from the object, receive a decussation, and so strike a second base upon the _Retina_ or hinder coat, the proper organ of Vision; wherein the pictures from objects are represented, answerable to the paper, or wall in the dark chamber; after the decussation of the rayes at the hole of the hornycoat, and their refraction upon the Christalline humour, answering the _foramen_ of the window, and the _convex_ or burning-glasses, which refract the rayes that enter it. And if ancient Anatomy would hold, a like disposure there was of the optick or visual nerves in the brain, wherein Antiquity conceived a concurrence by decussation. And this not only observable in the Laws of direct Vision, but in some part also verified in the reflected rayes of sight. For making the angle of incidence equal to that of reflexion, the visuall ray returneth Quincuncially, and after the form of a V, and the line of reflexion being continued unto the place of vision, there ariseth a semi-decussation which makes the object seen in a perpendicular unto it self, and as farre below the reflectent, as it is from it above, observable in the Sun and Moon beheld in water. And this is also the law of reflexion in moved bodies and sounds, which though not made by decussation, observe the rule of equality between incidence and reflexion; whereby whispering places are framed by Elliptical arches laid side-wise; where the voice being delivered at the _focus_ of one extremity, observing an equality unto the angle of incidence, it will reflect unto the _focus_ of the other end, and so escape the ears of the standers in the middle. A like rule is observed in the reflection of the vocall and sonorous line in Ecchoes, which cannot therefore be heard in all stations. But hapning in woody plantations, by waters, and able to return some words; if reacht by a pleasant and well-dividing voice, there may be heard the softest notes in nature. And this not only verified in the way of sense, but in animall and intellectual receptions. Things entring upon the intellect by a Pyramid from without, and thence into the memory by another from within, the common decussation being in the understanding as is delivered by _Bovillus_.[168] Whether the intellectual and phantastical lines be not thus rightly disposed, but magnified, diminished, distorted, and ill placed in the Mathematicks of some brains, whereby they have irregular apprehensions of things, perverted notions, conceptions, and incurable hallucinations, were no unpleasant speculation. [168] Car. Bovillus de intellectu.