The concept of the record itself is an individualistic investigation into human experiences of sadness and grief, which is a loose theme acting as a lens for music that analyses those despairing moments in a constructive manner. As the chief songwriter here admits, "even the title is deliberately vague; on the colour spectrum, between blue and indigo, you can't really tell which is which. I look deep into that because, in life, we're taught that things are good or bad and there's no in-between, whereas really life is just a series of grey areas. A lot of films go to great lengths to portray those ambiguities, and they're all relative to how you interpret them - there's no monolithic answer. I think that's why people like football so much… it's empirical, it's binary, you know what you're getting. Life is not that, it's a mystery, and I don't understand it."