The Wave - Algernon Blackwood - Bog

Since childhood days he had been haunted by a Wave. It appeared with the very dawn of thought, and was his earliest recollection of any vividness. It was also his first experience of nightmare: a wave of an odd, dun colour, almost tawny, that rose behind him, advanced, curled over in the act of toppling, and then stood still. It threatened, but it did not fall. It paused, hovering in a position contrary to nature; it waited. Something prevented; it was not meant to fall; the right moment had not yet arrived.