Alsalam alaikom
This is the base of the measuring coloumn ................u can see how the section of the building changes due to water motion and dynamics..........the first section shape was a circle to make the water go circularly ...........that will decrease the impact effect on the walls .............
then the section goes to be a square..........which controls the motion and make it stable to be measured.....
this is a very complicated engineering solutions to be done in that periods and prove how genius were those people
