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The upper portion of the rocks is called the splash zone . This squeezing / pushing action by the muscles is called peristalisis ( perry-STAL-sis ) . Converting from the halfspaces to the vertices is called vertex enumeration . The window that Info creates to contain the footnotes is called ` * Footnotes * ' . One of the great pleasures for the reader of her books is the wealth of details , from large to small , that mark the Magic world as different from ours ( which in the books is called the Muggle world ) : the tall pointed hats the students wear in their classes , in which they study such topics as Potions , Transfiguration , Defense Against the Dark Arts , and even Care and Feeding of Magical Creatures ; the spells that are always in Latin ( " Expelliarmus !