What's the difference between the writing techniques of Market in the Sky and Blue Kingdom?

Similarly, they are all describing the imaginary world, pinning their feelings and ideals, and comparing the imaginary world with the real world. The difference is that the content described in The Blue Kingdom really exists in life through imagination, while the Market in the Sky does not exist in life. The former writes "reality" with "emptiness", while the latter writes "emptiness" with "emptiness"; The imaginary world described in The Blue Kingdom is more specific and richer in content, while the imaginary world written in The Market in the Sky only captures some typical details to sketch, leaving readers more imagination space.