Updated: Nov 28, 2020
The 192 red lines & broken lines in the upper diagonal half of the table of 64 hexagrams correspond to the 24 red yods, each weighted with the number 8, that line the perimeter of the octagon and the 192 blue lines & broken lines in the lower diagonal half correspond to the 24 blue yods, each weighted with the number 8, inside the perimeter that surround its centre. Arithmetically, this representation is possible because 384 = 64×6 = 8×8×6 = 8×48. The six yods per sector correspond to the six lines & broken lines in each hexagram, the eight sectors correspond to the eight types of trigrams arranged in the eight columns of the table and the weight 8 corresponds to their eight copies distributed one to each of its eight rows. One sector corresponds to the eight hexagrams in the diagonal of the 8×8 square array and the seven other sectors correspond to the seven copies of the trigrams above and below the diagonal.
In the case of the 3-dimensional Sri Yantra, one sector of the octagon generating the number48 corresponds to the 42 hexagonal yods at the centres of the 42 triangles and to the six hexagonal yods in the central triangle. The 21 red yods in the seven other sectors of the octagon correspond to the 168 yods on sides of the 21 triangles in one half of the Sri Yantra; the 21 blue yods in the seven others correspond to the 168 yods on sides of the 21 triangles in the other half of the Sri Yantra.