"To muse for long unwearied hours, with my attention riveted upon some frivolous device of the margin, or in the typography of a book; to become absorbed, for the better part of a summer's day, in a quaint shadow falling aslant upon the tapestry or upon the floor; to lose myself, for an entire night, in watching the steady flame of a lamp, or the embers of a fire; to dream away whole days over the perfume of a flower; to repeat, monotonously, some common word, until the sound, by dint of frequent repetition, ceased to convey any idea whatever to the mind; to lose all sense of motion or physical existence, by means of absolute bodily quiescence long and obstinately persevered in: such were few of the most common and least pernicious vagaries induced by a condition of the mental faculties, not, indeed, altogether unparalleled, but certainly bidding defiance to anything like analysis or explanation.

Yet let me not be misapprehended. The undue, earnest, and morbid attention thus excited ny objects in their own nature frivolous, must not be confounded in character with that ruminating propensity common to all mankind, and more especially indulged in by persons of ardent imagination. It was not even, as might be at first supposed, and extreme condition, or exaggeration of such propensity, but primarily and essentially distinct and different. In the one instance, the dreamer, or enthusiast, being interested by an object usually not frivolous, imperceptibly loses sight of this object in a wilderness of deductions and suggestions inssuing therefrom, until, at the conclusion of a daydream often replete with luxury, he finds the incitamentum, or first cause of his musings, entirely vanished or forgotten. In my case, the primary object was invariably frivolous, although assuming, through the medium of my distempered vision, a refracted and unreal importance. Few deductions, if any, were made; and those few pertinaciously returning in upon the original object as a centre. The meditations were never pleasurable; and, at the termination of the reverie, the first cause, so far from being out of sight, had attained that supernaturally exaggerated interest which was the prevailing feature of the desease."

"Berenice", Edgar Allan Poe