To this law of ideal value, there is opposed the real and practical law that actually obtains in the revival of images. It is rightly styled the "law of interest" or the affective law, and may be stated thus: In every past event the interesting parts alone revive, or with more intensity than the others. "Interesting" here means _what affects us in some way under a pleasing or painful form_. Let us note that the importance of this fact has been pointed out not by the associationists (a fact especially worth remembering) but by less systematic writers, strangers to that school,--Coleridge, Shadworth Hodgson, and before them, Schopenhauer. William James calls it the "ordinary or mixed association."[15] The "law of interest" doubtless is less exact than the intellectual laws of contiguity and resemblance. Nevertheless, it seems to penetrate all the more in later reasoning. If, indeed, in the problem of association we distinguish these three things--facts, laws, causes--the practical law brings us near to causes. Whatever the truth may be in this matter, the emotional factor brings about new combinations by several processes. There are the ordinary, simple cases, with a natural, emotional foundation, depending on momentary dispositions. They exist because of the fact that representations that have been accompanied by the same emotional state tend later to become associated: the emotional resemblance reunites and links disparate images. This differs from association by contiguity, which is a repetition of experience, and from association by resemblance in the intellectual sense. The states of consciousness become combined, not because they have been previously given together, not because we perceive the agreement of resemblance between them, but because they have a common _emotional_ note. Joy, sorrow, love, hatred, admiration, ennui, pride, fatigue, etc., may become a center of attraction that groups images or events having otherwise no rational relations between them, but having the same emotional stamp,--joyous, melancholy, erotic, etc. This form of association is very frequent in dreams and reveries, i.e., in a state of mind in which the imagination enjoys complete freedom and works haphazard. We easily see that this influence, active or latent, of the emotional factor, must cause entirely unexpected grouping to arise, and offers an almost unlimited field for novel combinations, the number of images having a common emotional factor being very great.