“Apartment 402” delves into Marie’s darkest thoughts, discussing her depression-related feelings of emptiness, hopelessness, and numbness. However, as she relies on herself to turn things around for the better, she hopes for a better future. This song was given the name “Apartment 402” because Marie herself lives in an apartment numbered 402, which she lays in quite often when she begins to spiral down and overthink.

The combination of guitar, piano and drums chords create a haunting feeling that dictates the tone of the song. The tempo slowly accelerates during the song, reflecting the intrusive thoughts that haunt Marie as she overthinks. However, in the final chorus, the tempo slows down with Marie’s voice being attenuated, portraying her acceptance of reality and willingness to improve no matter what.

One of the album’s main themes, facing the darkest parts of one’s mind head on, is portrayed clearly on this song. Marie wrote on her Instagram:

I’m shedding light on the darkest parts of my mind, and I’m letting everyone in.

Other songs on the album with a similar theme include “Serotonin,” “Rue,” and “Body And Mind,” all of which express vulnerability and openly discuss mental health issues.