He studied the timber and plaster walls for traces of cryptic designs at every accessible spot where the paper had peeled, and within a week managed to get the eastern attic room where Keziah was held to have practised her spells. It had been vacant from the first — for no one had ever been willing to stay there long — but the Polish landlord had grown wary about renting it. Yet nothing whatever happened to Gilman till about the time of the fever. No ghostly Keziah flitted through the sombre halls and chambers, no small furry thing crept into his dismal eyrie to nuzzle him, and no record of the witch's incantations rewarded his constant search. Sometimes he would take walks through shadowy tangles of unpaved musty-smelling lanes where eldritch brown houses of unknown age leaned and tottered and leered mockingly through narrow, small-paned windows. Here he knew strange things had happened once, and there was a faint suggestion behind the surface that everything of that monstrous past might not — at least in the darkest, narrowest, and most intricately crooked alleys — have utterly perished. He also rowed out twice to the ill-regarded island in the river, and made a sketch of the singular angles described by the moss-grown rows of grey standing stones whose origin was so obscure and immemorial.
Gilman's room was of good size but queerly irregular shape; the north wall slating perceptibly inward from the outer to the inner end, while the low ceiling slanted gently downward in the same direction. Aside from an obvious rat-hole and the signs of other stopped-up ones, there was no access — nor any appearance of a former avenue of access — to the space which must have existed between the slanting wall and the straight outer wall on the house's north side, though a view from the exterior showed where a window had heen boarded up at a very remote date. The loft above the ceiling — which must have had a slanting floor — was likewise inaccessible. When Gilman climbed up a ladder to the cob-webbed level loft above the rest of the attic he found vestiges of a bygone aperture tightly and heavily covered with ancient planking and secured by the stout wooden pegs common in Colonial carpentry. No amount of persuasion, however, could induce the stolid landlord to let him investigate either of these two closed spaces.
As time wore along, his absorption in the irregular wall and ceiling of his room increased; for he began to read into the odd angles a mathematical significance which seemed to offer vague clues regarding their pnrpose. Old Keziah, he reflected, might have had excellent reasons for living in a room with peculiar angles; for was it not through certain angles that she claimed to have gone outside the boundaries of the world of space we know? His interest gradually veered away from the unplumbed voids beyond the slanting surfaces, since it now appeared that the purpose of those surfaces concerned the side he was on.
The touch of brain-fever and the dreams began early in February. For some time, apparently, the curious angles of Gilman's room had been having a strange, almost hypnotic effect on him; and as the bleak winter advanced he had found himself staring more and more intently at the corner where the down-slanting ceiling met the inward-slanting wall. About this period his inability to concentrate on his formal studies worried him considerably, his apprehensions about the mid-year examinations being very acute. But the exaggerated sense of bearing was scarcely less annoying. Life had become an insistent and almost unendurable cacophony, and there was that constant, terrifying impression of other sounds — perhaps from regions beyond life — trembling on the very brink of audibility. So far as concrete noises went, the rats in the ancient partitions were the worst. Sometimes their scratching seemed not only furtive but deliberate. When it came from beyond the slanting north wall it was mixed with a sort of dry rattling; and when it came from the century-closed loft above the slanting ceiling Gilman always braced himself as if expecting some horror which only bided its time before descending to engulf him utterly.
The dreams were wholly beyond the pale of sanity, and Gilman fell that they must be a result, jointly, of his studies in mathematics and in folklore. He had been thinking too much about the vague regions which his formulae told him must lie beyond the three dimensions we know, and about the possibility that old Keziah Mason — guided by some influence past all conjecture — had actually found the gate to those regions. The yellowed country records containing her testimony and that of her accusers were so damnably suggestive of things beyond human experience — and the descriptions of the darting little furry object which served as her familiar were so painfully realistic despite their incredible details.