T. Roger Smith, Architecture: Gothic and Renaissance
“ The use of constructive columns is general; piers are by no means unknown, but fine shafts of marble meet the eye frequently in Italian churches. The constant use of the column for decorative purposes is a marked characteristic. Not only is it employed where French and English architects used it, as in the jambs of doorways, but it constantly replaces the mullion in traceried windows. It is employed as an ornament at the angles of buildings to take off the harshness of a sharp corner, and it is introduced in many unexpected and often picturesque situations. ”
