There were a few lights, cars parked diagonally at the curb, a movie theater, a store window displaying pink underwear among kitchen utensils.
Two diagonal ridges stood out faintly on his forehead, parallel with his slanting eyebrows.
The diagonal lines stood out sharper on Wynand’s forehead.
If we take the horizontal as the one-dimensional, the vertical as the two-dimensional, the diagonal as the three-dimensional, and the interpenetration of spaces as the fourth-dimensional—architecture being a fourth-dimensional art—we can see quite simply that this building is homaloidal, or—in the language of the layman—flat.
There are no more uses of "diagonal" in the book.
Show samples from other sources
The artist used diagonal lines to create tension.
A pink scar started under his right eye, hit the corner of his nose, and ran diagonally across his upper lip.