Our universe is composed of many things that make logical sense.

For example humans breath in oxygen and breath out carbon dioxide, plants breath in carbon di-oxide and release oxygen.  The eco system components complement each other perfectly.

Our world is comprised of materials which are useful.

For example we can use trees to create heat which enables us to survive in weather conditions that can be uncomfortable or even deadly.

It just is.

I wonder how this complex array of integrated components (e.g., earth, water fire) to name just a few basic things that naturally compliment life, came to be.

Things work together naturally in an organic way.   People kind have extended the ways things are used  so we can have better lives, however, the core substance of the things appears to me to be too ordered to just randomly occur.

A Higher Power

Throughout humankind the concept of some thing being the brains behind the universe (i.e., a god) exists because intuitively it makes sense.

Although we can explain human creation through the theory of evolution the basic components of the universe connect together in such a logical way it is hard to believe some external design was not at play.

Random

Could our world, our universe developed just as a happy accident? Were things planned and or orchestrated with a purpose.   Is our universe by design or a natural progression.

Given the complexity of the Universe we live in I personally find it hard to contemplate it all as something that was created without a plan and direction.

The real mystery lies with figuring out what that thing was.