Christian, thank you for posting this! Up to this day, there are healers that use the mentioned banana leaf method, but instead of using baybayin, they write Latin oracion with the Roman alphabet replacement. Often times, this is followed by the “tugging” of the leaf over the supposed area of complaint. When there is a resistance, that is the area that is considered “Napilayan” (sprained or misaligned), hence the specific spot that the healer works on.
The “subtle energy” experiment makes a lot of sense, and can be studied as radionics – the use of objects or symbols to bring on an effect such as healing, sorcery, or in this case, influential germination. Subtle energy is neither positive nor negative, but when dictated with intention plus the added power of sound, a Cymatic effect occurs (http://www.youtube.com/watch?v=05Io6lop3mk&feature=related). These experiments have also been used with sacred chants, which provide certain vibrations that create unique forms in the sand and other substances. Each baybayin character or a combination thereof, therefore, can be considered to posses the manifestation of or potential for spiritual energetic influence. Okay, enough of my blabbing. 😀