The ancient Greeks were fond of memory systems. Simonides, the Greek poet who lived about 500 B.C. was one of the early authorities, and his work has influenced nearly all of the many memory systems that have sprung up since that time. There is a romantic story connected with the foundation of his system. It is related that the poet was present at a large banquet attended by some of the principal men of the place. He was called out by a message from home, and left before the close of the meal. Shortly after he left, the ceiling of the banquet hall fell upon the guests, killing all present in the room, and mutilating their bodies so terribly that their friends were unable to recognize them. Simonides, having a well-developed memory for places and position, was able to recall the exact order in which each guest had been seated, and therefore was able to aid in the identification of the remains. This occurrence impressed him so forcibly that he devised a system of memory based upon the idea of position, which attained great popularity in Greece, and the leading writers of the day highly recommended it. 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."