the seed-syllables of the elements are different from those of the Dhyani-Buddhas, who in other respects correspond to them. The colours of elements show a similar tendency, in so far as they do not coincide with the colours of the Dhyani-Buddhas
Govinda argues that seed syllables constitute a discrete symbolic system whose codes cannot be mechanically transposed between elemental and Buddha-mandala frameworks, even when these frameworks share the same cakra.
, Foundations of Tibetan Mysticism, 1960thesis