I believe the song is about two people in a clearly dysfunctional relationship (perhaps one of them is even being unfaithful) but they refuse to acknowledge that their is any disharmony. Instead they mindlessly trudge through their routine as a couple, going through the motions as if all is fine. The chorus saying 'its like giants falling down' is to me a reference to how 'Giants' are mythical beings that most people don't believe ever existed (easy to be dismissive of). Giants is representative of how ignorant this couple is over the state of their relationship, so much so in fact that its become almost a mythological scale mess of discord.
I believe the song is about two people in a clearly dysfunctional relationship (perhaps one of them is even being unfaithful) but they refuse to acknowledge that their is any disharmony. Instead they mindlessly trudge through their routine as a couple, going through the motions as if all is fine. The chorus saying 'its like giants falling down' is to me a reference to how 'Giants' are mythical beings that most people don't believe ever existed (easy to be dismissive of). Giants is representative of how ignorant this couple is over the state of their relationship, so much so in fact that its become almost a mythological scale mess of discord.