The song "Castles in the Air" by Hoodoo Gurus is about building dreams and expectations in a relationship. It speaks of the narrator's desire to create a perfect world (a castle in the air) for themselves and their partner, away from the burdens of reality. Initially, the narrator believed that they could achieve this dream-like state, as symbolized by the castle in the sky. They were willing to put in the effort (try) to make it work and escape the troubles of the world (worldly care). However, they soon realized that this idealistic view was not entirely realistic. The lyrics mention the need to learn fast and understand the truth of life. Hell and heaven can be experienced simultaneously, and pleasure always comes with an equal amount of pain. This realization leads to a shift in perspective, acknowledging that everything will work out despite the challenges. The analogy of a kite is used to convey the idea that for something to fly, it needs a string. Similarly, in a relationship (strings attached), there are certain obligations or constraints (holding us tight). However, despite these limitations, the couple can still take flight and pursue their dreams. Overall, "Castles in the Air" explores the themes of chasing dreams, the balance between pleasure and pain, the reality of life's challenges, and the resilience of love and hope.