Catherine Black (Kelly Reilly) is a famous neurologist who secretly has bipolar disorder; the only person who knows is her psychiatrist, Dr. Helen Hartramph (Vanessa Redgrave), who was with Catherine after her first break and has been a maternal figure for Catherine since her mother, who also suffered from bipolar disorder, committed suicide.
Definition of Black box: In science and engineering, a black box is a device, system or object which can be viewed in terms of its input, output and transfer characteristics without any knowledge of its internal workings. Its implementation is “opaque” (black). Almost anything might be referred to as a black box: a transistor, an algorithm, or the human brain.
The opposite of a black box is a system where the inner components or logic are available for inspection, which is sometimes known as a clear box, a glass box, or a white box.