A true friend is consistently willing to put your happiness before your friendship. It's said that "good advice grates on the ear," but a true friend won't refrain from telling you something you don't want to hear, something that may even risk fracturing the friendship, if hearing it lies in your best interest. A true friend will not lack the mercy to correct you when you're wrong. A true friend will confront you with your drinking problem as quickly as inform you about a malignant-looking skin lesion on your back that you can't see yourself.This probably ties us closer to our friends than many would like to admit. When our interests diverge and we can find nothing to enjoy jointly, time spent together tends to rapidly diminish. Not that we can't still care deeply about friends with whom we no longer share common interests, but it's probably uncommon for such friends to interact on a regular basis.
A moving picture is an illusion that makes a still photo seem to move. The basic principal behind motion pictures is the fast transition between one picture to the next, almost creating a seamless transition. A flip-book is a good example of this. Another example would be film used for old movies. The film contains negatives of an image which when light is shined through creates a "shadow" of the image. If you quickly transition the film from one image to the next you end up a motion picture.
Composers use motives to create unity in music, and change their motives to fit a musical context that achieves the expressivity they seek.
