In Penelope Fitzgerald's "The Gate of Angels," the author expresses profound reflections on nature and perception. The belief that grass is green suggests that this color provides a sense of calmness to humans, while the blue sky symbolizes the vastness of the universe. These colors not only serve aesthetic purposes but also help convey deeper meanings about existence and the human experience.

Fitzgerald further explores the symbolism of red blood, associating it with the detection of crime and the pursuit of justice. This connection emphasizes the moral responsibility to recognize wrongdoing. The closing thought on living without reason highlights a complex view of life, where existence persists despite lacking a clear purpose, raising questions about the nature of life and individual beliefs.