The arms undulate up and down, the eyes bulge in and out, and the mouths open and close. What I did not imagine is that all of that motion derives from one central shaft.
The vehicle has a row of huge propane tanks down the middle, and it unloads so fast (from liquid to gas), that the tanks need a circulating warm water bath to keep them from freezing up.
jurvetson
CC BY 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/44124348109@N01/48668369656/">https://www.flickr.com/photos/44124348109@N01/48668369656/</a>