Dreams like yours can be rich in symbolism and meaning. Let's break down some of the elements:

1. Courtroom: This setting often represents judgment, authority, or facing consequences. It could reflect feelings of being judged or pressured by societal norms or expectations.
2. State Representatives: These figures may symbolize authority figures in your life or aspects of governance and control. They might represent your own feelings about rules and regulations or how you perceive power dynamics.
3. Girl Visible in Dim Lights: The girl who can only be seen in dim light might symbolize hidden truths or aspects of yourself that are not fully acknowledged. She could represent intuition, creativity, or a part of your identity that only surfaces when you are in a more relaxed or vulnerable state.
4. Brother as a Pterodactyl: This transformation suggests a duality in personality or emotions. Your brother's ability to turn into a pterodactyl when angry may symbolize how anger can lead to a loss of control or a drastic change in behavior. The need for calming by the color green could represent a longing for peace, nature, or balance in your life.
5. Ball Under the Tables: Playing with a ball suggests playfulness or a light-hearted approach to life, while the ball going under the tables could indicate that something important is being overlooked or hidden from view in your waking life.

Overall, this dream could reflect your feelings about authority, hidden aspects of your personality, and the dynamics in your relationships, particularly with family. It may also suggest a need for balance and calm in the face of anger or conflict.

Consider what aspects of your life resonate with these themes and how you can bring more awareness to those areas.