Milo lifted his arm suddenly and pointed toward the open-air theater, where the milky, dust-filled beam bursting horizontally from the projector slashed a conelike swath in the blackness and draped in a fluorescent membrane of light the audience tilted on the seats there in hypnotic sags, their faces focused upward toward the aluminized movie screen.
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.