Here is a design concept for a poster with the theme of "The Wandering Earth": Title: The Wandering Earth Subtitle: Journey to a New Home Image: A beautifully illustrated image of the Earth in space, surrounded by stars and other celestial bodies, but instead of being stationary, the Earth is shown as moving forward through space, as if it is on a journey. The continents can be seen rotating on the planet's surface. Tagline: "The fate of humanity rests on one epic journey." Color Scheme: The poster can be designed in blue and silver tones to emphasize the sci-fi and futuristic theme of the movie. The title text and tagline can be in bold white, with additional text in a clean sans-serif font in light gray. Overall, the poster should aim to evoke a sense of wonder, excitement, and adventure, while also conveying the high stakes of the journey faced by the characters in the movie.