Chirality (Huh?)

One might ask the question,

if you were speaking to an alien on another planet by radio,

could you explain to him, which is your right hand?

Not, unless you could establish some common point of reference.

But that is the point.  According to current physics,

there is no preferred point of reference, no preferred direction in space or time.

Yet, we know from biology that chirality is critical.

Amino acids are chiral.  Your body uses left-handed amino acids only.

If all you had to eat was food with right-handed nutrients,

you would starve to death.

It can be argued that chirality is purely relative, and therefore irrelevant.

Life forms on other planets may use right-handed amino acids.

It will be interesting to find out.

But the metaphysical question before us is whether reality has arbitrary parameters,

or is there indeed some basic principle that provides an absolute, universal reference point?

Chirality is the example, but in general, other examples could also be used.

For example, there is now evidence that the universe is "lop-sided," or anisotropic.

If so, then this might (or might not) be extremely important.

It might lead to the question, is the universe moving, or rotating,

or otherwise interacting with a larger multi-verse?

I think that chirality is an under-appreciated facet of metaphysical speculation.