Although archaeological evidence and petrographic study show that some or all of the casing stones were cast in situ rather than quarried and transferred, this is not the case. [116] Petrie observed in 1880 that the pyramid's sides are "quite noticeably hollowed" and that "each side has a kind of groove specifically along the centre of the face," which he attributed to greater casing thickness in certain regions. A laser scanning assessment in 2005 verified the presence of the abnormalities, which may be ascribed to damaged and removed stones to some extent. [118] The faces may seem divided under certain lighting situations and with picture enhancement, leading to conjecture that the pyramid was built on purpose to be eight-sided. [119]
