You could not function and you could not go on in life if you thought there was only one level of depth. If there were only one level of depth, then all paintings would mean exactly what they seemed to mean at face value. All the lyrics in every song ever recorded would mean exactly what they seemed to mean, art would never need to be explained to anyone or at all elaborated on in any way. If you have a dream in which you see a lot of different levels of depth to different things, the differences would lie totally in what kind of items you saw the depth in.
If you were to have a dream about a deep kiss for example, and the deep kiss was being shared between you and someone else that was pretty important to you then this dream would mean that you were worried about the integrity of that kiss between you and that special someone and it would also mean that you were worried about how important this person was to you. Who was the other person you were sharing the deep kiss within the dream. Was this someone that was close to you or was it someone that you did not really care about. If you shared a deep kiss with someone you really cared about in your dreams then it means that you really need to bit the bullet and see if they are interested in you in real life. If you have a dream in which you share a deep kiss with someone that you do not really like then it means that you subconsciously think that thy like you and want to be with you.