On the other hand the producer must be careful to keep sufficiently in contact with reality, as otherwise the emotional interests upon which the whole play depends would be destroyed. We must not take the people to be real, but we must link with them all the feelings and associations which we would connect with real men. This is possible only if in their flat, colorless, pictorial setting they share the real features of men. For this reason it is important to suggest to the spectator the impression of natural size. The demand of the imagination for the normal size of the persons and things in the picture is so strong that it easily and constantly overcomes great enlargements or reductions. We see at first a man in his normal size and then by a close-up an excessive enlargement of his head. Yet we do not feel it as if the person himself were enlarged. By a characteristic psychical substitution we feel rather that we have come nearer to him and that the size of the visual image was increased by the decreasing of the distance. If the whole picture is so much enlarged that the persons are continually given much above normal size, by a psychical inhibition we deceive ourselves about the distance and believe that we are much nearer to the screen than we actually are. Thus we instinctively remain under the impression of normal appearances. But this spell can easily be broken and the esthetic effect is then greatly diminished. In the large picture houses in which the projecting camera is often very far from the screen, the dimensions of the persons in the pictures may be three or four times larger than human beings. The illusion is nevertheless perfect, because the spectator misjudges the distances as long as he does not see anything in the neighborhood of the screen. But if the eye falls upon a woman playing the piano directly below the picture, the illusion is destroyed. He sees on the screen enormous giants whose hands are as large as half the piano player, and the normal reactions which are the spring for the enjoyment of the play are suppressed.