The oldest depiction of a crucifixion we have, the Alexamenos Graffito (dating from the late 1st-3rd century AD), clearly shows the crucified figure's feet as being separate. Other early images, such as a late 2nd-3rd century carved jasper either from Syria or Gaza (part of the Pereire Collection), a graffito found in Puzzuoli, another gem, and a relief from Santa Sabina in Rome (ca. 430-435 AD), follow suit in not showing the feet as being placed above the other. This convention has passed on to later Christian iconography, and for a time people, both in the East and the West, portrayed Jesus Christ being crucified with His feet separate.
|'Alexamenos, worship God'|
In 1985, Joe Zias, then-curator of Archaeology/Anthropology for the Israel Antiquities Authority and Eliezer Sekeles reexamined the bones and found that the nail which Haas reported to be 17-18 centimeters long was but 11.5 centimeters, thus making it anatomically impossible to pierce two heels with one nail. The two heels would have not been nailed together, but nailed separately to either side of the upright post of the cross, so that he straddled it (the Visual Bible's The Gospel of John follows this reconstruction).