Final answer:
Charlie believes that life should be approached with a creative mindset because it is a canvas for personal expression and a never-ending masterpiece of experiences.
Step-by-step explanation:
When Charlie says, "I feel like our life is one big work of art," he means that life should be approached with a creative mindset. Evidence from the text supports this interpretation. For example, Charlie states, "I need a lot of ideas so that I can explore any number of possibilities for my future." This shows that he sees life as a canvas for personal expression and believes in the artistic value of routine and repetition. Additionally, Charlie mentions that "You live and design your life in collaboration with others," indicating that life is a never-ending masterpiece of experiences.