First impressions can be misleading, but nevertheless we all tend to make them. Today's exercise is to write about a screen door.
Is it new or old?
Does it make a sound when it is opened?
Does is make a noise when it closes?
Is it dirty or clean?
What color is it?
What impression does the screen door make upon the person walking up to it? These are the kind of details that show the reader what to think rather than tell them. Go on now, write--and don't let the door hit you.