Castles in the air and Pipe dream

Pipe dream and castles in the air are semantically related. in daydream topic. In some cases you can use "Pipe dream" instead the phrase "Castles in the air" as a noun or an adjective, when it comes to topics like imaginary, concept.

Pipe dream noun - A conception or image created by the imagination and having no objective reality.

Castles in the air and pipe dream are semantically related. Sometimes you can use "Castles in the air" instead the phrase "Pipe dream" as an adjective or a noun.