lol why would you ask that on here XD but aight sure
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.
The Parting of Lot and Abraham is about their literal parting - Abraham took his family to Canaan, as God wanted him to, whereas Lot went to Sodom, and defied God's wishes. Now, having this in mind, maybe this mosaic does symbolize B. heaven, as Abraham and his family would go to heaven eventually, because they obeyed God's orders and wishes.