The system of Simonides was based upon the idea of position—it was known as "the topical system." His students were taught to picture in the mind a large building divided into sections, and then into rooms, halls, etc. The thing to be remembered was "visualized" as occupying some certain space or place in that building, the grouping being made according to association and resemblance. When one wished to recall the things to consciousness, all that was necessary was to visualize the mental building and then take an imaginary trip from room to room, calling off the various things as they had been placed. The Greeks thought very highly of this plan, and many variations of it were employed. Cicero said: "By those who would improve the memory, certain places must be fixed upon, and of those things which they desire to keep in memory symbols must be conceived in the mind and ranged, as it were, in those places; thus, the order of places would preserve the order of things, and the symbols of the things would denote the things themselves; so that we should use the places as waxen tablets and the symbols as letters." Quintillian advises students to "fix in their minds places of the greatest possible extent, diversified by considerable variety, such as a large house, for example, divided into many apartments. Whatever is remarkable in it is carefully impressed on the mind, so that the thought may run over every part of it without hesitation or delay. . . . Places we must have, either fancied or selected, and images or symbols which we may invent at pleasure. These symbols are marks by which we may distinguish the particulars which we have to get by heart.''

Many modern systems have been erected upon the foundation of Simonides and in some of which cases students have been charged high prices "for the secret." The following outline given by Kay gives the "secret" of many a high priced system of this class: "Select a number of rooms, and divide the walls and floor of each, in imagination, into nine equal parts or squares, three in a row. On the front wall—that opposite the entrance— of the first room, are the units; on the right-hand wall the tens; on the left hand the twenties; on the fourth wall the thirties; and on the floor the forties. Numbers 10, 20, 30 and 40, each find a place on the roof above their respective walls, while 50 occupies the centre of the room. One room will thus furnish 50 places, and ten rooms as many as 500. Having fixed these clearly in the mind, so as to be able readily and at once to tell exactly the position of each place or number, it is then necessary to associate with each of them some familiar object (or symbol) so that the object being suggested its place may be instantly remembered, or when the place be before the mind its object may immediately spring up. When this has been done thoroughly, the objects can be run over in any order from beginning to end, or from end to beginning, or the place of any particular one can at once be given. All that is further necessary is to associate the ideas we wish to remember with the objects in the various places, by which means they are easily remembered, and can be gone over in any order. In this way one may learn to repeat several hundred disconnected words or ideas in any order after hearing them only once." We do not consider it necessary to argue in detail the fact that this system is artificial and cumbersome to a great degree. While the idea of "position" may be employed to some advantage in grouping together in the memory several associated facts, ideas, or words, still the idea of employing a process such as the above in the ordinary affairs of life is ridiculous, and any system based upon it has a value only as a curiosity, or a mental acrobatic feat.