What does light and dark symbolize in flowers for algernon?

In "Flowers for Algernon," light and dark symbolize knowledge and ignorance, respectively. Light represents enlightenment, clarity, and the potential for growth as Charlie Gordon undergoes an experimental surgery that temporarily increases his intelligence. Conversely, dark signifies confusion, isolation, and the struggles of those who remain unaware or uneducated. This contrast underscores the emotional and intellectual journey Charlie experiences throughout the narrative.