@tkasasagi This Tōyūki’s text is not a mystery. It is the Pictural Heart Sūtra (絵心経), the so called Tayama version (田山系). There are 64 pictograms in this version. Here is an introductory paper on it by Claudia Marra:
https://t.co/UM12CILyXt https://t.co/sA7uL0wPgH