Close Analysis of Girl Interrupted

According to Charles Darwin and his theroy of evoluiton, everything is a factor of its habitat. Giraffes have longer necks to reach food, the cheetah has retractable claws to increase speed, and polar bears have an extra layer of blubber for warmth. Along with these physical adaptions, animals can also develop behavioral adaptions. To put it simply, they form to fit the needs of their enviorment. My question is, does this law also apply to humans?
Do we adapt to acclimate to the enviorment we inhabitat?

Girl interrupted is the memoir of  Susanna Kaysen's 18-month stay within a mental institution. Susanna serves as both the narrator and main character of the story, and it is through her experiences that the term "crazy" is defined. Upon her admition, she denies accusations of suicide. Accusations that question her sanity. Although as the story progresses, she begins to see lunacey as a possiblity. The confidence she held about her sanity wavers as her stay within the mental hospital increases. Infact, at one point she even admits that she was suicidal and insane, quoting "I am a crazy girl". But after an encounter with her head nurse, Valarie, she believes in her own sanity again. The setting did not change, but what did change was what she was being told. Which leads one to believe, humans are not only a factor of their enviorment, but of others dwelling within their enviorment. This is shown through the film's presentation.

 The chronological order of the story and the narration give the film its personality. The film contains a series of flashbacks, infact, the film itself is an entire flashback being told by Susanna. This gives the viewer a sense that Susanna is personaly telling them her memory. Through her narration and perspective, we can percieve her decline into insantiy and rise out of it. Her sanity is also displayed through the color scheme used on set. When things are dark and grey, we know that she is mentally unstable. When colors are vibrant and alive, we know that she is coherent. More than anythinng else, Susanna's mental stuggles are displayed through the film's allusion to The Yellow Wall Paper. The parellels of Susanna and the narrator writing journals, being constantly diagnosed with different mental states, being held recluse against their will, and the struggle for control all too much display the effects an enviorment and the people in the enviorment have on other inhabitants. 

Both narrators were removed fromt their former enviorment and placed within a new one. They both molded to fit the part their new habitat had carved out for them - a mentally insane female. This image was reinforced by the other people within their habitat. Unlike the Giraffe's neck growing over time, their change was faster because they needed to adapt sooner. How else would they cope with the conditions they had to face, the way they were treated and the lunatic they were accused to be? In order for them to keep their sanity, they had to become insane.

We are the creation of factors beyond our control. And if we can't control anything, can we even control who we become?