A simple use of the visual memory is to make a picture of the thing
which you wish to do, in the place where you wish to be reminded of
doing it, called Reminder Pictures. This principle can be applied to
errands and to very important ideas. Seeing the thing you wish to do
will form the strongest possible impression. By seeing this picture in
the place where you wish to be reminded of it, you have associated it
in your mind in connection with the thing which is to be used to bring
it again into your consciousness.
The latter half of the picture--the place in which you wish to be
reminded of it--must be familiar, at the same time a place or object
which is going to be physically visible at the time you want to be
reminded of doing the errand. This principle can most easily be
understood by the use of illustrations which are actual examples of how
others have used the idea.