A few notes regarding Us-ness?
if Un-ness, the practice of searching from sensations of Un is an attempt to provide a beginning. A beginning that opens up possible kinds of ways to sense Un, the sensations, the aesthetics of Un -. As a search, it might not be bound by these sensations and practice.
(( This "being unbound", while perhaps being another kind of an Un sensation, is in reference to the possibility of this practice, and practices in general, to alter from initial sensations to some others. Perhaps, for example, Un sensations are boring, or too limited, or some other stuff that might come up which will indicate a need to link up and possibly move on to some other sensations? ]]

[[ Perhaps mistakenly, maybe an element that should be discussed, is the question of how practices might be different to works, projects and other ultimately defined processes. Since this Un sense is a practice rather than a project, a work or an object - it is being done as:
Made from elements that can be made into objects, projects and works. ie the LINK can be used for interpreting into processes with defined ends and endings.
Made in an ongoing way, ie as a practice its evolving and altering and can be added to at anytime. There is, I think, a sense of Un-Ending-ness to practices, no? ie say my practice is coding, it might contain coding projects, but coding, like writing, eating, painting and swimming, etc., are practices that may go on and on and on as long as their practitioners find them interesting. (I am a bit concerned that it will be perceived as a thoughtless process due to it not even being "a work in progress". ie, there isn't a premise that promises there will be a sort of rounded, counter-pointal, symmetric, meaningful and made-to-be-approached stuff at the end.) ]]
My own practice of Un Sensations is in terms of the abstract character of the un sensations. That abstract character, or might be characters, are evolving. This evolution is at a certain distinct beginning here. A beginning that, I think, could be open to others for joining in and transforming, transferring, translating into other ways and sequences.
Hence the usage of abstract ways and elements rather than mere abstractions. Abstract elements, I think, might indeed lend themselves to be transformable, trans-able into other materials, processes, and operations. For example, colours might be abstracts that are transformed by materials like paint and processes of painting into artisticly linked operations with meanings and cultural significances. While un-senses do not use colours, the usage of abstract elements is directly linked with questioning how to do abstract cultural practices that are indeed meaningless and maintain a focus on qualities.
A colour, eg green, is an abstract that can be embodied in various ways, a hex number, a paint, a leaf, and so on.. The colour is, I think, an abstract as it is drawn away from meaningful expressions, and manifestations of specifity - manifestations of specific nature. This "drawing away", allows colours to be used as applications in various contexts, gain meanings and expressions, embodyments. Therefore, a given colour, a bit like a given number, contains the quality of being applied into various means and operations, as well as the quality of being itself. ie green colour has a quality of rejecting the vibration that produces the sensation of green colour. In this way, I think it can be argued that the colour sequences, the sequences that produce sensations of one colour or another, are abstracts that live away from their various embodyments. ie have a certain distinguishing characteristics which create an interval between them and particularising embodyments. (e.g. green as a paint, green as a painted objects, etc.) Perhaps noting this distinction could clarify that by abstract there isn't a reference invoking ideas of perfection, but of elements and sequences' own reality. In terms of perfection, Platonian or otherwise, I think that if we are talking of a reality, eg reality of numbers, colours, or other abstracts - by being a reality, it probably fails perfection.. ;) of m
Another element that might require being questioned here is that of aesthetics?