Natural forms are wonderfully varied, and often intricate in their beauty, but this also makes them hard to accurately describe. There are inherent difficulties in measuring the exact border of any physical object. Try measuring the perimiter of a lake sometime, if you don't know what I mean. For one thing, a smaller measuring rod will yield a larger result than longer one, and a string will yield a larger result than a thick rope, so long as care is taken to follow the border exactly. In addition there's the question of how one can define a border which is undulating with the waves on the water's surface.
Life forms are like that too.
If you look at living cells under a microscope, they have fuzzy edges which undulate in a variety of ways, depending on their type. In the case of animal cells, they don't really have a solid border at all, but rather a semi-permeable membrane which provides for limited exchange with the outside environment. There are electrons which circulate both inside and outside the body, and they follow us wherever we go, at least until our next little shock. There are also other things which circulate around us, like dead skin cells, scent molecules, little bits of exhaled breath, and so on. We are connected to our world on several levels at once, whether we like it or not, and whether we know it or we don't.