According to the notice in front of the exhibit this is a reconstruction, using the original pieces, of a mosaic star from the Niche of (the) Madonna <a href="//commons.wikimedia.org/wiki/User:Richard_Avery" title="User:Richard Avery">Richard Avery</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Richard_Avery" title="User talk:Richard Avery"><span class="signature-talk">talk</span></a>) 14:00, 15 May 2014 (UTC)
myself (<a href="//commons.wikimedia.org/wiki/User:Piotrus" title="User:Piotrus">User:Piotrus</a>)
CC BY-SA 3.0
<span class="int-own-work">Self-photographed</span>