Billie Eilish thinks Jimmy Fallon is a vertical brown rectangle

She also chatted with Fallon about how her new album came about.

“It really just happened. I, like, didn’t know what I was going to do at all until really almost when the album was over. I didn’t even know what it was going to be called, I didn’t know what the vibe was going to be, I didn’t know what the artwork should be. I knew, though, that I wanted it to feel very specific, you know? I wanted it to have a real… feeling to it and a real aesthetic to it.”

She also discussed her synesthesia, a brain condition in which a person associates colors and numbers to people and objects. For instance, she sees Tuesday as purple, while her father, who also has synesthesia, sees it as orange.