listensee/ seelisten

I have been recently very much interested on the issue of visibility and invisibility in the area of music performance. What happens when the realm of the live performance is detached from a visual outcome?
The act of seeing implies a whole array of associative and interpretative connotations that, together with the act of listening, conform the global reception of a piece of music. The collection of gestures that is attached to a particular musical situation, the 'blank spaces of time' before the sound exists (say, a flutist breathing before an entrance, a pianist raising his hand immediately before depressing a key...) conform the universe of performance. The projection of these gestures in our retina completes the whole process of signification of everything captured by our ears. In my eyes, we do not just listen to music in a concert, we rather 'listensee' (or 'seelisten' (?)).
I have recently written and performed a piece which deals with the act of seeing and not seeing. 'Vacíos' ('voids') is a piece in which there are not visible performers, everything happens behind a curtain or wall, creating a hidden space in which the performance takes place. The visible space of the stage contains several objects and instruments (tubes, a piano performed with threads, some percussion instruments, water bowls...) which are activated from the invisible side. The piece works as a sort of 'theater of listening' ('Hörtheater') in which the listener receives a residual element of the performance. The music and the objects of the visible realm are triggered from a completely inaccessible realm for the audience. Therefore, these are perceived as residual, extended and peripheral elements of the real performance. The 'gestures' are not observable anymore but their physicality activates the music through a 'still life' (should I rather say a 'revived still life'?) of visible instruments and sound transmitters.