If you draw a perfect circle, then measure its diameter, measure its circumference, divide circumference by diameter, you get PI, always.
There's no intelligent design there, it just IS, it's fact, it's math, a circle is defined as an 2d object where the diameter is the same measured from any edge to another passing through the center, no intelligence, no magic, just math.
Just as 1+1 = 2, no intelligence, it just is.
If these facts are true, and there are other facts that ring true regardless of circumstance, then you have solid building blocks for a complex system without design.
Whoa, slow down people!
We take "1+1=2" for granted, but it's easy to forget the learning process that every child (or civilisation) goes through, that they start off in a world without numbers. It takes intelligence to imagine that there exists a "1" of something, and if that 1 exists "again", we can create the
idea of "2" to represent "1 and 1", and so on. If nature somehow worked differently, presumably the maths deduced from it would also be different.
So when you say "it just is" you skip the point that "1+1=2" is true because we made it that way.
To me it seems that what we normally think of as maths, is
deduced from whatever nature provides us with. Things are divisible? OK, so we have numbers. Things can be arranged in space? OK, so we have dimensions. Trouble is, that would make maths a subset of nature, and therefore it cannot fully describe everything about its superset.
Hence the whole god / intelligent design / whatever she-bang. It could be said that our "inner being" that witnesses 1000s of different smells and sensations that simply can't be explained in terms of "microscopic Lego particles configured into
Von Neumann machines", is the living embodiment of mathematical axioms: the things that are set to 'true' but can't be proven.
We didn't make it that way. We observed it. Math is neither a superset nor a subset of nature. It's a protocol, expressed in many languages including base 12 and Roman Numerals. Our scale, the decimal point that was the atom, then the quark and string, and now this geometric construct is relative. The microcosm is the macrocosm.
EDIT: Smell consists of extremely quantifiable microscopic particles affecting our nervous system.