Let me tell you something about the harmonic Pi that our Ancient Egyptian Architectonic Masters did interpret it geometrically, using the language of the two eyes. RMP#48 shows an example of interpreting geometrically that kind of Pi, i.e., it shows the geometrical correlation between two musical notes in the same musical octave, with a gap of two notes interval, e.g., between Do and Me. The upper note is equivalent to 4 and the lower note is the harmonic Pi = 256/81. It is one of the basic architectonic rules in the pyramids design philosophy. Thus we say this is the horizon of the two sounds Me-Do or the Per-Me-Do. Identifying which two musical notes should be used, in the numeric term, for designing such pyramid follows another rule.