Cairo pentagonal tiling
... that the Cairo pentagonal tiling was a favorite pattern of M. C. Escher?
... that the <b id="mwCkc"><a href="./Cairo_pentagonal_tiling" id="mwCkg" rel="mw:WikiLink" title="Cairo pentagonal tiling">Cairo pentagonal tiling</a></b> was a favorite pattern of <a href="./M._C._Escher" id="mwCkk" rel="mw:WikiLink" title="M. C. Escher">M. C. Escher</a>?