When Ridings sits at the piano, she finds it's easier to write sad songs than happier ones. She told Apple Music
the thought of writing an uptempo song like "Castles" was out of her comfort zone. However, this song's message of "finding that inner phoenix-like fire to come back out of the ashes of that hard time and make your life better" was something she felt passionately about.
The singer added that the theme of rejuvenation has been a huge one throughout her life. "If you can turn the darkest moments of your life into the greatest, that's a superpower."