So aus dem Stegreif fuer mich nicht moeglich, aber ich habe es so gelernt.
Hier ein Auszug aus Dzogchen:
In distinction to the channels that circulate
prāṇa, or vital energy, the crystalline
kati channel is described in oral tradition as a ‘light channel’
that connects the Clear Light wisdom located in the heart chakra with the Clear Light awareness ‘seated’ in the brain.
The seed-syllable ‘Hum’ refers in Vajrayāna Buddhism to the innate wisdom mind while, in Dzogchen, the seed-syllable ‘Ah’ represents the mind’s primordial nature (Logos). While the syllable ‘Hum’ is illustrated on the western mural in the context of the preliminary Dzogchen practices, ‘Ah’ is pictured far more frequently and often substitutes for instances in which Pema Lingpa’s text specifies the visualisation of a ‘Hum’. In any case, the practice described here, ‘Retaining Wakefulness in the Vase’, is often done while visualising an
‘Ah’ at the centre of the heart which lights up the interior of the body and radiates beyond it, leading to ‘capturing Luminosity during deep sleep’.
https://brill.com/view/journals/asme/7/1/article-p225_9.xml?language=en