Have you a stereoscope with views? The views show two photographs, almost alike, mounted side by side on the same card. Yet when you look at them through the lens of the stereoscope, you see but one picture. And that picture stands out, or is, as we say, "in relief." In an ordinary photograph everything appears flat. In stereoscopic views the solid appearance of things, with depth, distance, or perspective, is brought out as in life. That is because the ordinary camera has but one eye, or lens. The stereoscopic camera has two lenses, and takes two views, as far apart as a pair of human eyes. You see but one picture, exactly as you would have seen the real view with your two eyes. If you examine them very closely you will see that the two views, are not exactly alike. One shows more detail on the right outer edge, the other on the left. Look at something with both eyes. Close one eye. At that end the object you look at is blurred. Open that eye and close the other. The object is blurred at the other end. When we look at things, we really get two images from two points of view, as we say. The brain focuses these images as the stereoscope lens does, and brings them together into one view. In this way we see solid, or "in relief," so we judge of size, location, distance, solidity, color, and many other things better than if we had but one eye.