大毘盧遮那成佛經疏 15.11

15.11

次說漫荼羅形，計合息災在前，今隨聲便事便，增益在前也。諸增益事漫荼羅，方□（而黃色）息災壇；圓○而中白色，降伏壇；三角△其中黑色，攝召壇；半月其中雜色。攝召，謂雜取物呼召等也。經云四方普者，是舉一例諸也。如中壇方，謂方則普皆方，為圓亦如是次第也，三角等亦然者，乃至外院皆方。若中圓者，乃至外次第皆圓，護摩作鑪亦爾，若壇方火壇亦方也。餘皆例知耳。

Next, the shapes of the maṇḍalas are explained. By calculation, pacification ought to come first, but here, following convenience of sound and convenience of ritual action, increase comes first. A maṇḍala for acts of increase is square [and yellow]; the altar for pacification is circular and white within; the altar for subjugation is triangular and black within; the altar for summoning is a crescent and multicolored within. 'Summoning' means variously attracting and summoning [deities, spirits, or objects]. The sūtra says, 'Square everywhere,' which is to cite one [instance] to illustrate the rest: just as the central altar is square, meaning if square it is universally square, so for the circular it follows this same order; and with the triangular and the rest it is likewise, extending all the way to the outer precinct being square. If the center is circular, then extending to the outer [precincts] in sequence all are circular. In homa, making the hearth is also like this: if the altar is square, the fire hearth is also square. The rest are to be understood by analogy.