This figure is the simplified outline of a drawing by Roger Hayward from an article on "Blivets: Research and Development" published in <i>The Worm Runner's Digest</i> (December <a href="https://en.wikipedia.org/wiki/1968" class="extiw" title="en:1968">en:1968</a>) and reproduced in <a href="https://en.wikipedia.org/wiki/Martin_Gardner" class="extiw" title="en:Martin Gardner">en:Martin Gardner</a>'s <i>Mathematical Circus</i> (Pelican Books <a href="https://en.wikipedia.org/wiki/1981" class="extiw" title="en:1981">en:1981</a>, ISBN 0 14 02.2355 X).  Hayward's version shows a stone monument with its two (or is it three?) legs standing in a lake, thereby concealing the details of the bottom of the legs which would otherwise have committed him to deciding on their number.
<p>Specific drawings such as Hayward's are copyrighted, but the simplified outline in blivet.png has been repeated in so many places that it can be considered public property.
</p>
Licensing for this particular rendition:
The original uploader was <a href="https://en.wikipedia.org/wiki/User:Heron" class="extiw" title="wikipedia:User:Heron">Heron</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>.
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons by <a href="//commons.wikimedia.org/wiki/User:Master_of_Puppets" title="User:Master of Puppets">Master of Puppets</a>.