Build castles in air and Pipe dream

Pipe dream and build castles in air are semantically related. in think about seriously topic. In some cases you can use "Pipe dream" instead a verb phrase "Build castles in air", when it comes to topics like make up fantasy.

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

Build castles in air and pipe dream are semantically related. Sometimes you can use "Build castles in air" instead a verb phrase "Pipe dream".