Conversations with God in the Garden of Eden: Genesis 3 and 4

I find it amazing how God is showing my simple truths as I read through Genesis. In the garden of Eden God was physically present. I have always known that God was there but to think that he was physically present with Adam and Eve really amazes me. It makes me wonder at what point was God no longer physically present? Was God present in all His glory? What did Adam and Eve talk to God about? This thought leads me to realize that God is still present with me today but in the form of the Holy Spirit. Since Jesus died on the cross everyone who believes in Him has free access to God. Do we realize how much of a blessing and gift it is to be able to pray to God?