Sentences with Castles In The Air

The scientist's proposal for a perpetual motion machine was met with skepticism, as many considered it to be mere castles in the air.

Clara's idea of finishing a marathon without any prior training sounded like castles in the air to her friends who were experienced runners.

Emily's plan to master the art of origami and create life-sized sculptures out of paper was creative but seen as castles in the air.

Despite her fear of heights, Jessica envisioned herself conquering Mount Everest, but it was viewed by others as mere castles in the air.