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The books sent to the orphanage by William Minerva are all very subtle messages for the kids, from what the orphanage wants to do with the kids to how to survive should they manage to escape. Minerva's stamp (ex libris) on the inner front cover of selected books has imperfections on the ring surrounding its owl emblem that, upon closer examination, spell out words in Morse code, for instance, and that is the least hidden of his messages.
Morse code is a cipher that encodes text characters as standardized sequences of two signals, "dots" and "dashes". The morse code is first invented by Samuel F. B. Morse in 1838 to send signals by telegraph.
Morse based his code on short and long buzzes. When the code is written out, a dot represents a short buzz and a dash a long buzz. When Morse code became widely used, S.O.S. (··· ––– ···) was chosen as an international distress signal because the combination of the letter O's 3 dashes (–––) and the letter S's 3 dots (···) is easy to transmit and recognize in Morse code.
Usage in the story
Eventually, William Minerva chose the Morse code as a method to warn the orphans of the secrets and dangers lurking inside and outside the orphanages. Minerva owned several books which have his logo attached to each of them as Ex Libris, they were later exported to the libraries of the premium farms. These Ex Libris are specifically directed to the orphans as secret messages for them to decode.
- Run (·–· ··–· –·)
- Doubt (–·· ··· ··–· –··· –)
- Danger (·–· ·– –· ––· · ·–·)
- Monster (–– ––– –· ··· – · ·–·)
- Plantation Demons and Wild Demons .
- Farm (··–· ·– ·–· ––)
It is later revealed that Minerva also wrote a letter to the escaped children once they reached the shelter. In the first letter found by Yugo and later by Ray, Minerva congratulated the children on their successful escape from their plantations and that he is waiting for them at a similar shelter located at A08-63.