<a href="https://en.wikipedia.org/wiki/Tessellation" class="extiw" title="en:Tessellation">Tessellation</a> <b><a href="https://en.wikipedia.org/wiki/Michel_Onfray" class="extiw" title="en:Michel Onfray">Michel Onfray</a></b> (French philosopher), <a href="https://en.wikipedia.org/wiki/Figure%E2%80%93ground_(perception)" class="extiw" title="en:Figure–ground (perception)">figure-ground</a> <a href="https://en.wikipedia.org/wiki/ambigram" class="extiw" title="en:ambigram">ambigram</a>. Black, white and gray tones. <a href="https://en.wikipedia.org/wiki/Negative_space" class="extiw" title="en:Negative space">Negative space</a> used for both words.
<a href="//commons.wikimedia.org/wiki/User:Basile_Morin" title="User:Basile Morin">Basile Morin</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>