The column and ceiling are in the water board, dating from the 14th century. their job is quite literary to regulate the ebb and flow of water in the vast low areas surrounding the city. The fisherman set nets, rice is grown the oranges are irrigated.
As with much of Spain the Moorish influence is impossible to miss. The tiled rooftop is a glaring example, but the style is so woven into the fabric of the culture it is easily misunderstood.