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The reason of this is that if you look at the movement of the wateryour eye will not be able to fix on anything, but its action is as that of things seen in your shadow when you are walking; for if the eyeat-tempt to distinguish the nature of the shadow, the wisps of strawor other things contained in it appear of rapid movement and it seems that these are much more swift to flee from the said shadow than the shadow is to proceed.

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It is perhaps just dawning on five or six minds that physics, too, is only an interpretation and exegesis of the world (to suit us, if I may say so!) and not a world-explanation.

If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from you.

We know more about the movement of celestial bodies than about the soil underfoot.

Shadow partakes of the nature of universal matter. All such matters are more powerful in their beginning and grow weaker towards the end, I say at the beginning, whatever their form or condition may be and whether visible or invisible. And it is not from small beginnings that they grow to a great size in time; as it might be a great oak which has a feeble beginning from a small acorn. Yet I may say that the oak is most powerful at its beginning, that is where it springs from the earth, which is where it is largest.

Shadow is the diminution alike of light and of darkness, and stands between darkness and light.

Light is the chaser away of darkness. Shade is the obstruction of light. Primary light is that which falls on objects and causes light and shade. And derived lights are those portions of a body which are illuminated by the primary light. A primary shadow is that side of a body on which the light cannot fall.