Navicella
... that only two small fragments remain from 1,333 square feet (123.8 m2) of Giotto's Navicella mosaic in Old St. Peter's Basilica?
... that only two small fragments remain from <span about="#mwt42" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"1333"},"2":{"wt":"sqft"}},"i":0}}]}' id="mwDEw" typeof="mw:Transclusion">1,333 square feet (123.8</span><span about="#mwt42" typeof="mw:Entity"> </span><span about="#mwt42">m</span><sup about="#mwt42">2</sup><span about="#mwt42">)</span> of <a href="./Giotto" id="mwDE0" rel="mw:WikiLink" title="Giotto">Giotto</a>'s <i id="mwDE4"><b id="mwDE8"><a href="./Navicella_(mosaic)" id="mwDFA" rel="mw:WikiLink" title="Navicella (mosaic)">Navicella</a></b></i> mosaic <i id="mwDFE">(copy illustrated)</i> in <a href="./Old_St._Peter's_Basilica" id="mwDFI" rel="mw:WikiLink" title="Old St. Peter's Basilica">Old St. Peter's Basilica</a>?