Dahshur pyramids were an important learning experience for the Egyptians. It provided them with the knowledge and know-how to transition from step-sided pyramids to smooth-sided pyramids. Ultimately their breadth of experience would allow them to build the Great Pyramid of Giza; the last of the Seven Wonders of the Ancient World still standing to this date. The first of the Dahshur pyramids was the Bent Pyramid (2613–2589 BC), built under the rule of King Sneferu. The first attempt at building a smooth sided pyramid, but proved to be an unsuccessful build due to the miscalculations made on the structural weight that was being placed onto the soft ground (sand, gravel, and clay), which had a tendency to subside. Other calculations that were proven to be erroneous were that the blocks being used were cut in such a manner that when placed onto the pyramid their weight was not distributed appropriately, causing the angle of the pyramid to be off and achieving the name "the Bent Pyramid.