Their square configurations make them impractical for use in crucifixion, and their balanced vertical and horizontal elements convey a natural union of male and female, making them symbolically consistent with Priory philosophy.
There are no more uses of "horizontal" in the book.
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Paintings in which horizontal lines dominate, tend to be relaxing.
The whole thing goes horizontally, too, at least it seems so, and I exhaust myself in trying to distinguish the order of its going in that direction.