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The Hat Full of Sky is a novel from Terry Pratchett's Disco World series, continuing the adventures of the little witch Tiffany Sores.

Tiffany is eleven, and she becomes a student of the experienced witch Miss Level. The girl dreams of flying on a broomstick, conjuring with a wand, learning spells, but she has to do a lot of housework, and also go to villages and help people without any magic.

Tiffany gets used to stepping out of her body to look at herself when she doesn't have a mirror at hand. But it turns out to be a dangerous exercise, because you never know who might use it and for what purpose. Tiffany learns what it's like not to be herself, and once again becomes convinced that the sign of a true witch is not a fashionable hat at all.