The alternating characteristics of external objects contain a constancy and regularity which, when applied to the senses, support a structure which complies with our perceptions and understanding. There are, however, certain impressions which are temporary and rely solely on the imagination for their furtherance, as in taste, odor, color, etc. These impressions perish from the senses and are only resurrected by experiencing them over again. They are temporary qualities represented as images and not as objects. They are, in fact, internal impressions interchangeable between subjects and existing only long enough to be experienced through sensation before suddenly dashing off into an imaginary dimension.
Certain objects, in their continued existence as external impressions, contain characteristics which are constant and remain always as being. For example a fire burning in a fireplace. If one builds the flames to a comfortable level, leaves the premises and returns an hour later, the fire would have still retained its characteristics as in providing heat, particular colors of the flames, the scent of burning wood, etc. The only change which takes place is the intensity of the heat and flames. The fire is still fire. It is constant and remains an entity with scant differences of its characteristics. It exists distinctly as a product of a real external world. On the other hand, secondary qualities, as in taste, smell, color, are temporary and have no existence beyond the internal impressions of the one experiencing them. Once an apple is tasted, that particular sensation or characteristic eventually vanishes. It cannot linger in space as a real object. Its existence (taste, texture) perishes, never to return as what it once was. It is only the imagination which could recreate the sensation, although it cannot exactly, but only do so through reflection, and a subjectively questionable reflection, at that.
The alternating characteristics of external objects remain as sensations vanishing into permanent refuge in the imagination even if never again reflected upon. It’s those characteristics which are constant, as in a mountain range, or a wide expanse of a flourishing meadow, which stress an existence that, through perception, are permanent and belong to a reality where the sensibilities immerse themselves in the perceivable world.
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