Bent Pyramid

Sneferu's pyramid begins at 54 degrees and shifts to 43 partway up, almost certainly because the steeper slope showed signs of instability while building. It is the best-preserved of the early pyramids, retaining most of its original limestone casing, and it is the transitional object between the stepped pyramids of Saqqara and the true pyramids at Giza — the moment the design was corrected mid-build.