Brightness
How much light you bring to what you're looking at. Controls whether you see the hopeful side or the dark side of a situation.
Graham and Learning Detachment Through Practice
Brightness. Graham consciously chooses to focus on what's going well rather than dwelling on failures. He mentions living in a constant 'high' because he only chooses to notice things that go his way, actively directing his mental spotlight toward positive outcomes while dimming attention to setbacks.