<a href="https://en.wikipedia.org/wiki/ambigram" class="extiw" title="en:ambigram">Ambigram</a> <b>¡OHO!</b> and drawing of reversible female face by <a href="https://en.wikipedia.org/wiki/Rex_Whistler" class="extiw" title="en:Rex Whistler">Rex Whistler</a>, 1946 (but created before since the artist was dead in 1944), up and down. 180° rotational symmetry. The face of a young woman changes into a grandmother. Title of the book: <i>Certain Two-Faced Individuals Now Exposed By The Bodley Head</i>. Publisher: <i>The Bodley Head</i>, John Lane, London. Publication Date: 1946.
<bdi><a href="https://en.wikipedia.org/wiki/en:Rex_Whistler" class="extiw" title="w:en:Rex Whistler"><span title="British painter, illustrator (1905-1944)">Rex Whistler</span></a>
</bdi>
published in 1946, created before 1944
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