The right arm of God is outstretched to touch the left arm of Adam extended in a pose mirroring God's, reminding that man is created in the image and likeness of God. God's imminent touch to Adam would breathe life into him and ultimately will give life to all mankind. It is, therefore, the birth of the human race.
The Greeks started making the Columns while building temples. They started with the Doric, then advanced to the Ionic and later the Corinthian Columns. These architectural designs are used widely today in the construction of storey buildings and other sructures.