Reminder Pictures
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.