Painted niche decoration from the Dura Europos Mithraeum

"Around the niche were found fragments of a series of small paintings set in a semicircular band of panels. On the left side, next to the bottom, a reclining figure was represented, his head projecting into the border of the panel. Immediately above this another head in a similar position was found. Farther up, in what would have been the third panel of the series, a small fragment bore the legs of a kneeling figure and above this were what appeared to be the feet of two figures. If all the panels of this series were of the same width, there would have been precisely enough space for thirteen panels". (Rep., 102).