In jail, there is no pure. There is no good, so to say. Light is associated with humanity, peace and happiness. Would one think that jail is meant to be filled with happiness? No. Darkness is an epitome of bad, like a sinner in a church. You wouldn't see a joyful person inside a prison. Instead, it is filled with anger and regret. Miller sets the jail in darkness to create tension, bringing a gloomy mood.
Pick a topic you know a lot about and is easy to write about. If you dont really know a lot about a topic pick one that is easy to research like dogs or the importance of exercise.
