There are about 110 pyramids currently known in Egypt, many in a state of great disrepair and almost unrecognisable. Some were built as burial places for kings and others for queens. A pyramid also may have represented a stairway for the king to ascend to the heavens. Another possibility is that it was symbolic of the primeval mound on which the sun god/creator was born. How the Egyptians managed the complex organisation of labour and the physical movement of large stone blocks is still a matter for debate. Pyramid construction may have involved ramps being erected around the pyramid. Blocks of stone would have been pulled up on sledges and the ramps dismantled later. It is believed that most of the labour for the construction of the pyramids would have come from farmers who were available during the inundation season when the Nile River flooded and farmland was underwater. It would also have been an ideal time for the transportation by boat of large stone blocks from their quarries to the pyramid sites.