lithophane
... that lithophane is an artwork in porcelain that can only be seen clearly when lit from behind?
... that <b id="mwCic"><a href="./Lithophane" id="mwCig" rel="mw:WikiLink" title="Lithophane">lithophane</a></b> <i id="mwCik">(example pictured)</i> is an artwork in <a href="./Porcelain" id="mwCio" rel="mw:WikiLink" title="Porcelain">porcelain</a> that can only be seen clearly when lit from behind?