The classical elements such as the shaft which is like the cylinder like shape of the column. There are also flutes which are basically the gaps going vertically alongside the shaft. Then there is the capital which is at the top of the column which is the part which identifies a classical order. On the other hand the modern element that is being used is the fact that iron and steel used to be used instead of stone. This also creates more space as the columns look more thin and do not take up much space. Looking up to the ceiling there are huge. Though outside it looks like a regular stone building, it has iron arches in the inside in order to be able to Support rib vaulting with iron arches.