one of Piet Mondrian's paintings
... that after one of Piet Mondrian's paintings was discovered to have been hanging upside down for decades, the museum left it as is?
... that after <b id="mwBg8"><a href="./New_York_City_(painting)" id="mwBhA" rel="mw:WikiLink" title="New York City (painting)">one of Piet Mondrian's paintings</a></b> <i id="mwBhE">(shown)</i> was discovered to have been hanging upside down for decades, the museum left it as is?