The reality of our world exists without us. The world exists as it does due to it's position in the goldilocks zone. We evolved from that reality. With our senses we observe that reality which includes ourselves. We interact with our world the way we do because we have become top of the food chain. We evolved from the planet which supports us, we couldn't have evolved as we are on Mars. The source of the reality we perceive is the coming together of this rock with it's positioning in space and distance from the sun. We are no different from other animals, we have evolved our communication and logic skills through nature and nurture. However, we need to explore quantum levels and their basis in consciousness. As well as black matter which takes up 20% of our universe and dark energy which makes up 75%. That's how small we are in the scheme of things. How it exists is easier to answer than why. Why it exists - I don't know! Some people say we are worker ants, others we are cockroaches. Made by the planet to look after the planet, to reproduce, to be curious and find other ways to find other planets similar to ours to propel the species. Who knows, everything has it's use by date!