Ancient Roman <a href="https://en.wikipedia.org/wiki/labrum" class="extiw" title="en:labrum">labrum</a> (bath-tub) in Egyptian red <a href="//commons.wikimedia.org/wiki/Porphyry" class="mw-redirect" title="Porphyry">porphyry</a>, transformed into the <a href="//commons.wikimedia.org/wiki/Baptismal_font" class="mw-redirect" title="Baptismal font">baptismal font</a> of the <a href="//commons.wikimedia.org/wiki/Duomo_di_Milano" class="mw-redirect" title="Duomo di Milano">cathedral in Milan</a>, Italy. The question discutable is whether it originally belonged to the nearby public baths called "Thermae Herculeae". Picture by <a href="//commons.wikimedia.org/wiki/User:G.dallorto" title="User:G.dallorto">Giovanni Dall'Orto</a>, July 9 2007.
<a href="//commons.wikimedia.org/wiki/User:G.dallorto" title="User:G.dallorto">G.dallorto</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>