The rapidity of visualization can be greatly increased by effort and
training. There is great value in this ability, and it can be attained
by shortening the interval during which the object or exercise is
visible to the eye.
After the children have learned to form a definite, accurate picture,
try to shorten the time in which they see the objects. Strive until
they can take in the whole at a glance. The detail will continue to
develop after the eyes are closed. In the Letter and Number Games
gradually shorten the time given until they can reproduce the entire
row at a glance. Such effort will quicken the action of the brain area
of sight.
The story is told of a woman who so developed this ability that she
could secure a picture of the page of a letter in one glance and read
it from the visual image. She became a well-known government agent in a
foreign country, an internationally known spy.
All of the exercise given for the development of the sense of sight
can be used for visualization and later for observation. These two
important faculties are closely related to each other and both
dependent upon the eye. Later on you will see that the most used of all
the faculties--Memory--is in turn largely dependent upon all three.