Sentences with Castles In The Air

Timmy's elaborate blueprint for a treehouse made entirely of candy was cute but ultimately just castles in the air.

After winning the lottery, Jack envisioned a life of luxury with a private jet and a mansion, but it was just castles in the air.

Despite having no background in astronomy, Jake envisioned building a telescope to find new planets, but his plan was deemed castles in the air.

Jason's goal of memorizing the entire dictionary over the summer break was dismissed as impractical castles in the air by his classmates.