190. As terrestrial man's physical sensing is the most advanced, while his mental sensing within his present evolutionary spiral is of a far later date, then it is the physical condition which is the truer and more realistic for him and the mental one less true and less realistic. This brings about in him the desire to manifest his thoughts and ideas in physical material so as to present them in the most realistic and factual condition and to give them also the greatest possible stamp of reality for his fellow beings at the same stage of development as himself. This can happen only through physical material, in that a human being's mental sensing is, in addition, of a more imperfect and frail nature. This urge gives rise in the individual to an ability for "copying" his picture compositions already produced on the mental plane in memory material. When such a "copy" of a "mental object" is completed, the "copy" appears on the physical plane as a realistic physical object while the mental original, on the contrary, is described as that object's "idea" or "plan". Should that mental original constitute an "object" or "picture composition" put together of "auditory memories", the physical "copy" becomes a "sound composition" which is mostly expressed under the description of a "melody". If the mental original on the other hand is put together of "visual memories", the physical "copy" will be a "light and shade composition", for all visual experiences are based on light and shade. This means that the physical "copy" is just the same as that reality we describe as "art" or "created realities". And here we are confronted with the function of consciousness which lies behind all the creation of physical "art". All things which come under that description are thus copies of former mental pictures or thought pictures. But previously, long before this method of copying existed, terrestrial man had already learned another method of giving physical expression to his thought pictures. Such expressions were not "copies" but signs or marks of the thought pictures. Little by little he grew capable of give certain definite signs in a physical medium to the most prominent thought pictures in his mind in order to be able to make them comprehensible to his fellow beings' physical sensing. This sensing is a fundamental medium for exchanging thoughts or mental contact as long as the consciousness of human beings is still supported by the physical body. Thus they cannot communicate from mental body to mental body while awake, for these bodies are still not sufficiently developed and independent. Terrestrial man, therefore, has to transfer his thoughts to a physical form when he wishes to communicate with a fellow being. According to the physical nature of this form they can influence the corresponding physical senses and thereby cause them to react. This reaction becomes an experience of perception in the consciousness of those fellow beings in whom a reaction has taken place. So, depending on how much the faculty of recognition can be brought to react in the recipients, this experience of perception becomes a "recognition"; in other words, for those concerned it is brought to an experience either of information or of a vague sensing. Those who are transmitting the thoughts, then, are more or less understood by those receiving them.