Establishing the boundaries of a thing is indispensable for perceiving it. Contained in those boundaries is not only the thing, but the thingness of the thing – that it is somehow, in some sense, a whole.
Like the fourth wall in theater, the willing suspension of disbelief in fiction of any sort, the thing’s boundary, must be part of the thing, not part of the thing and not a whole in itself.
This relation is reproduced in the relation of every part to the whole, every part of every part that in itself is a whole of some kind.
The more tolerance there is to this infinite regress, to this paradox, the more a perceiver will be able to perceive. It is one of the challenges of the continued development of machine intelligence. So far, machine executed algorithms may exceed human capacities by order of magnitude in some areas, but they do not yet have this tolerance to a thing’s impossibility.