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Well this was a rather interesting find from a book sellers list at work. A mid 19th century book using SCIENCE to explain how eye and optical illusions work, to dispel the myths of the gullible who believe they see ghosts when they see optical illusions. The book comes with about 15 different cute supernatural spooky illustrations (very much like kids Halloween illustrations today) at which you are supposed to stare and then stare at the wall to see the shape as a spectre. It's pretty adorable, though credited as works of the creator so religious rather true science but still pretty fun.
I really enjoyed the aspects where the author used science to explain spectral phenomena. I wish there had been a longer and more in depth section, but what was provided was pretty interesting. The illustrations are fun, even if a tad bit silly.