Hitherto we have been dealing chiefly with forms which are the expression of emotion, or of such thought as is aroused within the mind by external circumstances. We have now to consider some of those caused by thoughts which arise from within—forms generated during meditation—each being the effect produced by a conscious effort on the part of the thinker to form a certain conception, or to put himself into a certain attitude. Naturally such thoughts are definite, for the man who trains himself in this way learns how to think with clearness and precision, and the development of his power in this direction shows itself in the beauty and regularity of the shapes produced. In this case we have the result of an endeavour on the part of the thinker to put himself into an attitude of sympathy and love towards all mankind, and thus we have a series of graceful lines of the luminous green of sympathy with the strong roseate glow of affection shining out between them (Fig. 37). The lines are still sufficiently broad and wide apart to be easily drawn; but in some of the higher examples of thought-forms of this type the lines are so fine and so close that no human hand can represent them as they really are. The outline of this thought-form is that of a leaf, yet its shape and the curve of its lines are more suggestive of a certain kind of shell, so that this is another example of the approximation to forms seen in physical nature which we noted in commenting upon Fig. 16.