"Attentive modern-day visitors to the Mediterranean world will notice a symbol depicting an eight-spoked wheel carved into stone walls, floors, and funerary art. This symbol has long been considered the remnant of an ancient game or the work of vandals, but author J. Daniel Hays argues its proliferation was the work of the early church, and it should be included in the greater corpus of Christian art, iconography, and symbolism. In The Ichthus Christogram...