The term "castle in air" refers to an imaginative or visionary scheme, plan, or idea that is considered to be unrealistic, impractical, or unlikely to be achieved. It signifies a project or ambition that is built purely on fantasies, without any solid foundation or realistic basis.
The phrase is metaphorically derived from the image of someone constructing a castle or grand structure in the air, without any physical material or structural support. Just as a castle in the air lacks solidity, a person's dreams, desires, or plans that fall into this category are considered to be lacking in practicality, substance, or feasibility.
Often used in a derogatory or critical manner, "castle in air" suggests that the individual's aspirations or goals are merely illusions or daydreams, disconnected from reality. It implies that the person should focus on more grounded and attainable objectives, rather than indulging in fanciful notions that are unlikely to come to fruition.
The term can also evoke a sense of whimsy or harmless fantasy when used to describe someone's imaginative or creative ideas that are not meant to be taken seriously. In such cases, it is used to highlight the person's ability to think outside the box or explore alternative possibilities, even if they are not easily achievable.
