In his new book 'Live Cinema and Its Techniques', Francis Ford Coppola lays out his rules of screenwriting and filmmaking in an early chapter:
1) Character is revealed by behavior.
2) A story can be told through unique moments between its principal characters.
3) The memorable moment is often unspoken.
4) Something needs to happen.
5) Emotion. Passion. Surprise. Awe.
6) The shot can be a word, but it's better when it's a sentence.
7) Audiences want to become involved with the characters, want that involvement developed.
8) Beware of the cliché, the predictable.
9) Audiences want themselves and their lives explained and illuminated.
Sound good to me. As to the exact meaning of #6, you have to read the book.