Claude Glass
...that the Claude Glass was a tinted mirror used by amateur artists in the 18th century in which they turned their back on the subject?
...that the <b id="mwBYA"><a class="mw-redirect" href="./Claude_Glass" id="mwBYE" rel="mw:WikiLink" title="Claude Glass">Claude Glass</a></b> was a tinted mirror used by amateur artists in the 18th century in which they turned their back on the subject?