"Castle of Glass" (stylized in all caps) is a song written by American rock band Linkin Park for their fifth studio album, Living Things.

[5] Loudwire noted in their Living Things review that the song features "very different electronic elements and unique sounding samples that the band have added to their musical palette.

Billboard wrote in their review of Living Things, "A folk song with LP's muscle, "Castle of Glass" uses compelling songwriting, extended metaphors and a simple but radical (for Linkin Park) arrangement to offer one of the album's most intriguing tracks.

"[8] AltSounds described "Castle of Glass" in their album review as "a drawn-out filler track that keeps to a crawling pace, is strangely passive and doesn’t leave you feeling very inspired.

[11] The video ends with a quote from Winston Churchill: "All great things are simple, and many can be expressed in single words: freedom, justice, honor, duty, mercy, hope.

[citation needed] The band's part of the music video was filmed entirely in front of a green screen, with the production being handled by Mothership and Digital Domain.