The Question and Answer section for Flowers for Algernon is a great resource to ask questions, find answers, and discuss the novel.
The window is a recurring image because he envisions himself, the way he was....behind the glass.
Charlie has a hallucination in which he seems to fly into the center of his own unconscious, a red pulsing flower, and then imagines himself being battered against the walls of a cave.
Charlie asks what Nemur’s plans were for him after the experiment, if the experiment failed to sustain permanent intelligence in him. The plan was to put Charlie in the Warren State Home and Training School (where Charlie was supposed to be...