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What is Spiritism? > Chapter II—Elementary notions of Spiritism > Concerning Spirits > 8
8. Generally speaking, people have a mistaken idea about the make-up of spirits. They are not, as some believe, vague and indefinite beings, nor are they flames like will-o'-the-wisps or ghosts like in the tales about souls from another world. They are beings like we are, with a body like ours, but fluidic and invisible in its normal state.