Jahn regularly mentions being in the Flow. When I refer to the Flow I am in part referencing the modern psychological concept of Flow, which is quite relevant to the whole naked child idea.
My understanding of what Jahn is saying with the naked child is he is basically talking about the Buddhist concept of the Beginners Mind.
I understand the Beginners Mind as kind of a neutral way of seeing. What I mean; in our normal biased perception we see things in shades. Shades of good, and bad, shades of pretty and ugly, with variable degrees of those qualifiers intermixed. These shades of views make us heavy, create tensions, reactions, and bias our decisions. The create a closed mind. What your looking at here is the fog in front of your eyes. When you self-remember or maintain inner silence for a long enough period of time you can see this fog right in front of your eyes. This stance of Presence is neutral, it deepens you, when sufficiently crystallized you connect to the Axis mundi. The ultimate neutral and openness of beingness. The beginners mind is to see your world with an attitude of openness, to see it as the ultimate beginner; a child. Nakedness is a lack of the psyche's clothing; a removal of your masks, a shedding of your form.
He mentioned being a mature adult who is a naked child. Again we have a fusion of two opposite poles; a neutrality. Adult and child at the same time. You retain your learning, but you see in a clear unbiased way.
To see things from aside, as Taimyr says, yes this much what we are talking about. Stepping outside yourself, is removing the masks of the false identity. Then Jahn mentions the curse of humanity; explains this as an extension of the families curse. We are all one big family. That family is internalized in each of us, it starts at an early age. Its sad how quickly the child's world is snuffed out. A bit of that remains as the inner child, and recapitulation resurrects it. When you see things from aside yourself the next step out is to see beyond the world internalized in you.
In psychology the concept of Flow, as described by Mihály Csíkszentmihályi is also a neutral position. Things are often to challenging or not challenging enough, but when you find the right balance you can access Flow. You don't make it happen, but being balanced allows it to.
With your blinders on you make things too heavy, or you take them for granted. You react to much or at the wrong times, you are overly emotional, or mis-emotional. If you adopt the naked child's mind you eventually clear the dross, and can enter the Flow.
It is not indifference.... You see through difference from a place behind and above.