Page 152 - The Miracle of Electricity in the Body

150 THE MIRACLE OF ELECTRICITY IN THE BODY

mauve. It cannot perceive frequencies that lie outside this range, such as
infrared or ultraviolet. This is, again, a very wise precaution. If our eyes
were arranged to perceive lower frequencies of light waves instead of
that specific range, then we would end up perceiving blurred images
like those on a radar screen. If our eyes were arranged to perceive higher
wavelengths, then we would perceive images rather like x-rays.
Through the mercy of God, however, the cells in the eye transform only
light waves within those dimensions into electrical signals, and thus al-
low us to see such colorful and detailed images.

The Three-Dimensional World That Forms in the Brain

The brain is exceedingly adept at determining the distance of ob-
jects. Both eyes act in tandem and register images seen from different an-
gles. The difference of angle between the two images helps the brain cal-
culate the distance of the perceived object. The two images transmitted
to the brain are compared and the distance of the object determined.
That is why you perceive this book as a three-dimensional image.
Were it not for that ability, we would see everything double and in a sin-
gle plane. And so, the fields of vision of the two eyes being at different
angles is a very wise result of creation.
Let us imagine that you are watching a tennis match. One of the
players easily returns a shot from over the net. Your brain forms an opin-
ion of what the shot is like. The light illuminating the ball, net and racket
all reach your eyes simultaneously, without your being aware of it. Yet
what you perceive as a racket or a tennis ball is an image resulting from
collaboration between your brain and a number of electrical signals,
each directed towards the relevant region of the brain. However, there is
no clue in your brain that you are watching this tennis match. Scientists
can describe how the data regarding sight, sound or scent is transmitted
toward the relevant parts of the brain. But what really surprises them is
how these electrical signals are reconstituted within the brain back to
their original form.