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In page Witches' Sabbath (The Great He-Goat):

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Art historian Fred Licht notes that Goya's brushwork appears "clumsy, ponderous, and rough" and lacking finish compared to his earlier work. Licht believes this was a deliberate ploy to physically convey dismay at human inadequacy and his own feelings of personal doubt.[14] Unique in the series, Witches' Sabbath was not significantly altered by Goya after his initial work.[11]