大毘盧遮那經阿闍梨真實智品中阿闍梨住阿字觀門 1.13

1.13

凡布字之法，當從行者眉間白毫而觀迦字，右旋逐曰而轉，令環相接；四重亦復如是，一一合集成身。

As for the method of distributing syllables, one should contemplate the syllable *ka* starting from the white ūrṇā between the practitioner's eyebrows, turning clockwise to follow the sun so that the links of the circle meet; the four tiers are also like this, each assembling together to form the body.