Final answer:
Walter's fantasy world for Travis is one where dreams provide happiness, but practical considerations and actions are necessary to make the fantasy sustainable. He speaks of love, protection, and the creation of a stable future as the foundation of this imagined world.
Step-by-step explanation:
The fantasy world that Walter paints for Travis consists of dreams and aspirations, which he views as a form of happiness. Walter feels the need to think and plan for the future, despite the allure of living permanently in a world of dreams. He speculates on the necessity of practical actions, such as supplying provisions, improving their living conditions, and facing the harsh truths of their existence, particularly concerning the girl, Bess.
The contemplation of this fantasy world is interrupted by practicalities and a renewal of purpose leading to actionable plans. Walter's dreams are underpinned by his love for Bess and his determination to protect her and create a stable future together.