People often confuse the INFP and the ISFP, as they are both quiet, laid back, gentle enigmas. They are also both intensely private inhabiting their own internal worlds but there is a major difference: INFPs are future oriented dreamers who enjoy flights of fancy and seeing many possibilities while ISFPs prefer to stop and savour the sensory, real experiences of the moment to the max. Neither are forthcoming types, both love the new, both dislike structure or being controlled, however the INFP will look up and dream big dreams and the ISFP will look down, immersing themselves in actual experiences.
These are subtle differences but they help us better understand the two character types, which, paradoxically, are often the most misunderstood. Both are astute observers of life, caring and loyal: yet they experience the world in very different ways with the INFP wanting to see way beyond the here and now and the ISFP wanting to remain there until their need for experience is satiated and they move onto the next, new sensory experience.
Our understanding of other people is often helped by a comparison of the more subtle points, the characteristics that really matter. Try comparing your type to a friend, or colleague and see how uncovering the subtle issues really help: