I have not been able to discern any purpose of existence. As for
its nature, we are in the progress of finding out by science.
True, we perceive nature indirectly through our transducers.
We can only have a model of nature. That model is good
enough to allow us to get around and survive in the world.
We are beginning to see that the real nature of the world
is somewhat different from that shown to us by our natural
senses. We have tools that can see what we cannot see.
From this we hope to improve our model of the world though
how close that model will be to its true nature we may never
be able to know.