The name Thought-form is derived from two words THOUGHT and FORM, that is, a concrete thought, a visible image.
The thought always produces a double effect:
– radiated vibrations (attenuate, proportional to the source, but like all oscillations tend to reproduce themselves, therefore, by acting on another mental body, they tend to excite in them their own rate of motion.) It should not be confused: the radiated vibes carry the character of thought, and not its Object, and therefore the Hindu, keen on the religious feeling for Krishna, and the waves of feeling poured out by him, stimulate piety from all who fall under their influence: the Muslim has feelings for Allah, the Christian has for Jesus.);
– form (there is an infinite variety of colors and shapes of such thought forms, because each thought attracts from outside the matter most suitable for its expression, and makes it vibrate in harmony with its own vibrations, so that the nature of the thought determines its color).
To the clairvoyant, the thoughtform is revealed as the vibration of the mental body and can be simple and complex. If the thought is absolutely simple, then only one frequency of oscillations is observed and only one type of mental matter undergoes a strong impact. In fact, human thoughts are not simple. Absolutely pure love, of course exists; but we very often find it painted with pride or selfishness, jealousy or animal passion. This means that in the astral and mental bodies at least two different vibrations appear, and often more. The radiated vibrations will, therefore, be complex, and the resulting thoughtform will be colored with several colors instead of one.
Annie Besant and C.W. Leadbeater, in his book “Thought-Forms“, derived three basic principles underlying the creation of thoughtforms:
1. The quality of thought determines the color.
2. The nature of thought determines form.
3. The certainty of thought determines the clarity of outlines.
If we consider the thoughts in terms of the forms that produce them, then we can divide them into three types: