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A loose version of Nightmare Fuel Coloring Book maybe? That does seem primarily focused on visual arts so it might be a bridge too far.
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Could be a Sister Trope to Art Reflects Personality.
^ Like Art Reflects Mood?
Currently Working On: Incorruptible Pure Pureness
^ Something like that, if it doesn't fit an already established trope better.
Nightmare Fuel Coloring Book for visual art, Madness Mantra for written or spoken word, Room Full of Crazy for stumbling onto previously unseen evidence of a character's insanity? Possibly graduating to Mad Artist if they keep doing it after the reveal.
There is also Cope by Creating
Mad Artist, definitely.
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
Basically, a character makes a piece of art (not necessarily visual art, it could be music, poetry, etc.) that is unusually disturbing for them, even if they are an artist. This happens right before the character does something very bad (such as attempt suicide), and usually the art is shown as a warning that the character is more mentally unstable than previously thought.
An example of this is in Doki Doki Literature Club!, where a female character who writes pretty but sad poems eventually writes a poem that's just "Get out of my head" over and over again, which makes the player go over to check on her—only find out she hung herself.
Edited by CyokieRevott