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Plato's Lambda
In Timaeus, Plato’s treatise on
Pythagorean cosmology, the central character, Timaeus of Locri (possibly a real person), describes how the Demiurge divided the World Soul
into harmonic intervals. Having blended the three ingredients of the World Soul — Sameness, Difference and
Existence — into a kind of malleable stuff, the Demiurge took a strip of it and divided its length into portions
measured by the numbers forming two geometrical series of four
terms each: 1, 2, 4, 8 and 1, 3, 9, 27, generated by multiplying 1 by 2 and 3 (Fig. 1). This became known as "Plato’s Lambda" because of its resemblance to
Λ, the Greek letter lambda. Then, according to
Timaeus:
“he went on to fill up both the double and the triple intervals, cutting off yet more parts from the original
mixture and placing them between the terms, so that within each interval there were two means, the one (harmonic)*
exceeding the one extreme and being exceeded by the other by the same fraction of the extremes, the other
(arithmetic) exceeding the one extreme by the same number whereby it was exceeded by the
other.These links gave rise to intervals of 3/2
and 4/3 and 9/8 within the original intervals. And he went on to fill up all the intervals of 4/3 (i.e., fourths)
with the interval of 9/8 (the tone), leaving over in each a fraction. This remaining interval of the fraction had
its terms in the numerical proportion of 256 to 243 (semitone). By this time, the mixture from which he was cutting
off these portions was all used up.”


The three numbers missing from the Lambda are shown in red in Figure 2. The sum
of the 10 integers is 90 and the sum of the integers 1, 8 & 27 at the corners
of the tetractys is 36. The seven integers at the centre and corners of the grey hexagon shown in Figure 2
with dashed edges add up to 54. Hence, the 36:54 division displayed by the Lambda Tetractys
differentiates between its corners, which correspond to the Supernal Triad of the Tree of Life,
and its seven hexagonal yods, which correspond to the seven Sephiroth of Construction (see
here). The division is shown by all holistic systems, as many of the
articles on this website prove. Historians of science and musical scholars have focussed upon the integers as
"number weights" whose significance is that their ratios are the tone ratios of the notes of the Pythagorean
musical scale. They paid no attention to the magnitude of the numbers themselves because, influenced by
the connotation given by Plato that their ratios determined the more important tone ratios, they seemed to
have no relevance to music or anything else. The author's research into various sacred geometries and holistic
systems indicates that this is untrue. The number 90 is always present in such systems as a defining parameter,
as this section will demonstrate. The Lambda Tetractys has been regarded as nothing more than a heuristic
device for generating the tone ratios of musical notes. Instead, it has profound, fundamental meaning, for
— together with its tetrahedral generalisation to be described shortly — it characterizes the very nature of
holistic systems. It is the arithmetic counterpart of the holistic pattern that
sacred geometries embody.
* H is the harmonic mean of two positive numbers a and b (b›a) if (bH)/(Ha) = b/a. A is their arithmetic mean if (bA)/(Aa) = 1.
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