Or it may show us enlarged a play of the hands in which anger and rage or tender love or jealousy speak in unmistakable language.

In humorous scenes even the flirting of amorous feet may in the close-up tell the story of their possessors' hearts.

Nevertheless there are narrow limits.

Many emotional symptoms like blushing or growing pale would be lost in the mere photographic rendering, and, above all, these and many other signs of feeling are not under voluntary control.

The photoactors may carefully go through the movements and imitate the contractions and relaxations of the muscles, and yet may be unable to produce those processes which are most essential for the true life emotion, namely those in the glands, blood vessels, and involuntary muscles.
Certainly the going through the motions will shade consciousness sufficiently so that some of these involuntary and instinctive responses may set in.