Double Gallery Houses of the South

I was curious to see if the columns on most double gallery homes were round or square because I've been driving around New Orleans and most seem to be square.  Jay took me to mid city where there are similar homes to ours and they are square too.  He seems to think the house was moved and the owner added rounded columns during a Greek Revival trend.  I'm thinking of going back to a square column since the ones I have need a lot of work anyway.  I like the look of the square better and seems to suit the subtle New Orleans style we're looking for.