The phrase ‘Building castles in the air' implies something imaginary.
Sample Usage
1. If you think that you will clear the interview without any prior workout, you are simply building castles in the air.
2. It is of no use building castles in the air; just concentrate on your studies and that would be the real thing.
3. One can achieve nothing by merely building castles in the air. One must work hard to achieve one's goal.
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