As Adam and Eve were thrown out of Kingdom of God due to eating apple from the tree of knowledge.
Before that they were enjoying the kingdom of god means they were looking at things with Wonder.
Knowledge acts as a barrier for wonder hence they lost the eyes to see things with wonder and stated recognising them basis their knowledge. This is called as thrown out of kingdom of garden. Actually we can never be thrown out of it, it is available to us by default.
I have posted three posts with title ending 1, 2 and 3 to help us understand it in detail. Each post is complete in itself, so anyone can be read independently.
Hope this will be of some help.