When we talk about world created by humans, we can see the imbalance, lack of harmony. We have created Internet, computer games, we have become technologically advanced but all of this has not made us healthier, live longer, even happier... When we talk about nature, the natural world, we can see how simple it is, there are birth, life and death... Mother Nature has always been great at achieving balance, harmony... In the end, we, humans are children of nature and therefore worlds created by us will be inferior to natural world. Basically, humans are just a part of natural world, and we will be spending quite a long time and a lot of efforts to get a bigger picture...
