The extent to which any activity is conscious seems to depend very largely upon how complex and how novel it is. The primitive and in a sense natural outcome of stimulus is action; the more simple the situation with which the mind is engaged, the closer is the connection between the stimulus and some overt response in action, and in general the less rich and full is the consciousness attendant. A man walking over uneven ground, for example, makes without reflection or emotion a continuous adjustment of his steps to his footing; but let the ground become precipitous and, unless he is used to such places, both reflection and emotion will appear. The increased complexity of the situation and the greater delicacy and appropriateness of the movements required for convenience and safety, call forth far more complicated goings on in the mind. Besides his perception of the nature of the ground, the thought may occur that a false move would be perilous and difficult to retrieve. This, when accompanied by emotion, is called a ‘realisation’ of his situation. The adjustment to one another of varied impulses—to go forward carefully, to lie down and grasp something with the hands, to go back, and so forth—and their co-ordination into useful behaviour alters the whole character of his experience. Most behaviour is a reconciliation between the various acts which would satisfy the different impulses which combine to produce it; and the richness and interest of the feel of it in consciousness depends upon the variety of the impulses engaged. Any familiar activity, when set in different conditions so that the impulses which make it up have to adjust themselves to fresh streams of impulses due to the new conditions, is likely to take on increased richness and fullness in consciousness. This general fact is of great importance for the arts, particularly for poetry, painting and sculpture, the representative or mimetic arts. For in these a totally new setting for what may be familiar elements is essentially involved. Instead of seeing a tree we see something in a picture which may have similar effects upon us but is _not_ a tree. The tree impulses which are aroused have to adjust themselves to their new setting of other impulses due to our awareness that it is a _picture_ which we are looking at. Thus an opportunity arises for those impulses to define themselves in a way in which they ordinarily do not.