Page 57 - Matter: The Other Name for Illusion

you would assume. In fact, the entire picture, as on a movie reel, exists on a two
dimensional frame, on only one surface within the brain. The images reflected
to the eye are two-dimensional, like those on a TV screen. In such
circumstances, how can a perception of depth and distance occur?
What is referred to as a sense of distance is a way of seeing three-

dimensionally. The elements causing the effects of distance and depth in
images are perspective, shade and motion. The form of perception called
spatial perception by optical science is provided by highly complicated
systems. This system can be explained simply in this way: The sight which
reaches the eye is two dimensional. That is to say, it has measures of height and
width. The senses of depth and distance result from the fact that two eyes see
two different images at the same time. The image that reaches each of our eyes

differs from the other in terms of the angle and light. The brain assembles these
two different images to form our sense of depth and distance.
We can perform an experiment to understand this better. First, extend
your right arm in front of you and hold up your index finger. Now focus on
this finger while closing your left eye first and then your right eye. Because two
different visions come to each eye, you will see the finger move slightly to one
side. Now open both of your eyes and while continuing to focus on your right
index finger, move your left index finger as close to your eye as you can. You
will notice that the closest finger will have created two images. This is because

now a different depth has formed in the closer finger from that in the farther
finger. If you open and close your eyes one by one, you will see that the finger
located nearer your eye will appear to move more than the finger which is
further away. This is due to the increasing difference in the views appearing in
each eye.
While a three dimensional film is being made, this technique is used;
Images shot from two different angles are placed on the same screen. The

audience wears special glasses which have a color filter and polarize the light.
The filters in the glasses filter out one of the two views, and the brain
transforms these into one single three-dimensional image.
The perception of depth in a retina with two dimensions is very similar to
the technique used by artists to give the observer a feeling of depth in a picture
with two dimensions. There are certain factors resulting in the feeling of depth,
such as the placement of objects on top of one another, the atmosphere
perspective, changes in texture, linear perspective, the dimensions, the height

It Is A Scientific Fact That The World Comes Into Existence In Our Brains 55