Subjectivity Subjective and objective are interdependent, having meaning only in relation to each other. Subjective is said to apply to whatever is referred to the thinking subject, the ego; objective to whatever belongs to the object of thought, the non-ego. Subjective and objective express a relation between the act of perception and the object perceived. To some extent the two words correspond to mind and matter, but parts of mind itself may become objects of some higher perceptive subject. Modern idealists say that the cooperation of subject and object results in the sense object or phenomenon, but this does not hold good on all other planes than that of the physical senses. Subject and object, however, are contrasted on every plane, and this contrast represents the experience of the perceiving ego. But the peak of omniscience, or knowledge of things in themselves, is not reached until the duality or contrast of subject and object vanishes into unity (SD 1:329, 320).
In scientific materialism, the word subjective is often used to mean unreal, in contrast with the physical world which is regarded as real -- despite the fact that it is one of the commonplaces of scientific thought that the physical world is perhaps of all things the most unreal of entities subject to knowledge. Thus an apparition may at times be described as being purely subjective, meaning that in such cases instead of being an actual external object it is a mental image considered objectively by the mind itself.