Because it marks limitation at every level of the story. Ra calls the 30 the gate of the Fates, which stop you from going the ordinary way. Pluto reached it early in the interregnum, around 1793, and he says Pluto's influence on the 30 began to limit the evolutionary possibilities of humans. Neptune was discovered in the 30 and returned there during the years he was teaching, and his warning about it is that with Neptune in the gate of the Fates you do not see your way clear, as it dissolves diversity. At the moment of the change itself the Sun stands in the 30, which he reads as freedom recognized as an illusion and limitation accepted as fate. And the cycle after the Phoenix, Contagion, runs on the 30. So the 30 threads through the switch, the dissolving, the moment and the next era. Ra did not read this as fatalism. Of the 30 at the change he says that being limited can become exalted into perfection.
This is not a fact, not medical advice and not a promise of healing. It is part of the cosmology Ra Uru Hu, who founded Human Design, left behind, and nobody knows exactly how it will unfold.
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