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Show Why We Have Two Eyee. Because we have two'oyes tho things wo sec fccein solid nnd not tint, with tli result that wo am Judge their distance dis-tance from us with fnlr correctness. Look through a window nt n houso across the street with ono eyo closed nnd then with tho other eyo closed. Tho bars of the window frame will cut ncros.1 tho opposite houso in different differ-ent places. Tho two fields seen with tho ojes separately, although In tho main nllke, differ. When you look nt tho houso with both eyes open tho two j fields seen by tho two eyes nro combined com-bined nnd the houso ncross the street ' assumes depth and relief. Although we see n hmi'-o with each eye, we see only one houso yltli both eyes. This makes the fctercoseope possible nn instrument in-strument so designed that the two eyes nro made to converge on n single point and et to see two different pictures. If these two pictures represent n chair as It would nppenr to the right nnd loft eyes respectively they arc perceived per-ceived ns one solid object Popular Science Monthly. |