Words that do Handstands

A lot of ambigrams can be found here:

http://cerulean.st/ambigram/indexold.html

At the risk of overexposure, there were also some strange claims made in 2009 whose source seems to have vanished but which I recall being based on a different machine ambigram generator, resulting in Cerulean responding with this 7×7 half-turn rotational ambigram grid (where transposing the matrix flips the images, so that there's 28 distinct images presented in 49 cells): https://ceruleanst.livejournal.com/177992.html?nojs=1

you can see the strange claim here: http://web.archive.org/web/20110702084440/http://www.ambigra...

"The Ambigram deck itself seems impossible at first, and in fact, it would have been impossible just a few years ago. No human being could have designed it alone, even if they possessed several lifetimes to work on the problem."

which is exactly what Cerulean's page refutes - it's a hand-designed 7x7 grid where each word transforms into each of the other words.