<P> Mrs Who is described as a plump woman with spectacles . She communicates in Latin, Spanish, Italian, German, French, Portuguese and Greek, notably quoting William Shakespeare, Pascal, Dante Alighieri, Seneca, A. Perez, Horace, Miguel de Cervantes, Delille, Euripides, the Bible and Johann Wolfgang von Goethe . Mrs Whatsit explains that Mrs Who finds it "difficult to verbalize" in her own words . </P> <P> Mrs Which's physical appearance is not set; she appears as a shimmering light most of the time . However, she does once take on the appearance of a traditional witch with a black hat and broom . She does not stay long in this form, though, as corporeal appearance is quite difficult for her to maintain . She first appears at the end of Chapter 3 . She is the clear leader of the three women and the wisest, and upon appearing, immediately demonstrates her vast knowledge of understanding in tesseract travel . Her distinguishing quirk is her long, drawn - out method of speech, symbolized by doubled and tripled consonants in her words (as in; "Nnoww, cchilldrenn, yyou musstt nott bee frrightennedd att whatt iss ggoingg tto hhappenn,"). She is the one who usually provides the group, most especially Meg, with the clues the children need to solve the problems encountered during their travels . </P> <P> IT is the bodiless, telepathic brain that dominates the planet of Camazotz and is the main antagonist of the story . IT controls all the people in Camazotz and makes people often do the same things together in a mechanistic synchronism as if they were robots . IT speaks through The Man With Red Eyes and later through Charles Wallace, and is functionally part of the interstellar evil cloud called the Black Thing . IT is described as a giant sized human brain . Housed in a dome near the "CENTRAL Central Intelligence" building, IT is said to pulse and quiver on its dais . IT's aim is to enforce absolute conformity on Camazotz, with the claimed benefit of eliminating war, unhappiness and inefficiency . However, IT is aware of cruelty, referring to "ITself" as "the Happiest Sadist". While IT usually speaks through one of its pawns, IT can speak directly to people through telepathy, but IT only does this once throughout the entire novel . IT's name is always used whenever IT is spoken of (rather than the pronoun "it"), so pervasively that even the word "itself" is rewritten as "ITself ." </P> <P> A formless, shadowy being . According to the Mrs. Whatsit, the Black Thing is the source of all evil in the universe . It is unclear from where the Black Thing came or what its motivations are . It is unclear what its relationship to IT is, although it is suggested that IT is a powerful servant of the Black Thing . Many people have fought the Black Thing and added to the peace of the world, including Mr. Murry . </P>

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