Feelings have been categorized across a complex continuum, from pain to pleasure. Feelings are now also understood to be completely subjective. A rose may be prickly in one experience but admirable in another, and within each of these experiences you might also choose just the opposite perception and related feeling. If you see a lush apple tree laden with fruit, some individuals might simply pass by, perceiving that the tree is too large, the apples too ripe, or the branches too heavy. Others might stop in admiration. Your perceptions are unique to you, and are relative to your past experiences, how you interpret them, your belief systems, your knowledge base and numerous other factors.