Based on Palindromes, Letters read the same upside down but switching from black to white negative spaces. Letters already with rotational symmetry gets embedded with itself instead. Didnt bother with the numbers much though. Couldnt make 6 remain a 6 upside down though a Ying Yang could have sufficed now that I think about it..
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Glitchy! I like it. Makes me think of ransom notes, but digital.
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