<a href="https://en.wikipedia.org/wiki/Necker_cube" class="extiw" title="w:Necker cube">Necker cube</a>, with the nearest vertex being the upper right of its two inner vertices.
<a href="//commons.wikimedia.org/wiki/User:Gauravjuvekar" title="User:Gauravjuvekar">Gauravjuvekar</a>
<span class="int-own-work" lang="en">Own work</span>