Dr. Tillinghast Sound System

" Suddenly I myself became possessed of a kind of augmented sight. Over and above the luminous and shadowy chaos arose a picture which, though vague, held the elements of consistency and permanence. It was indeed somewhat familiar, for the unusual part was superimposed upon the usual terrestrial scene much as a cinema view may be thrown upon the painted curtain of a theatre. I saw the attic laboratory, the electrical machine, and the unsightly form of Tillinghast opposite me; but of all the space unoccupied by familiar material objects not one particle was vacant. Indescribable shapes both alive and otherwise were mixed in disgusting disarray, and close to every known thing were whole worlds of alien, unknown entities. It likewise seemed that all the known things entered into the composition of other unknown things, and vice versa. Foremost among the living objects were great inky, jellyish monstrosities which flabbily quivered in harmony with the vibrations from the machine. They were present in loathsome profusion, and I saw to my horror that they overlapped; that they were semi-fluid and capable of passing through one another and through what we know as solids. These things were never still, but seemed ever floating about with some malignant purpose. Sometimes they appeared to devour one another, the attacker launching itself at its victim and instantaneously obliterating the latter from sight. Shudderingly I felt that I knew what had obliterated the unfortunate servants, and could not exclude the things from my mind as I strove to observe other properties of the newly visible world that lies unseen around us. But Tillinghast had been watching me, and was speaking.
“You see them? You see them? "

H P LOVECRAFT - From Beyond (1920)