Never saw this before. Is this rwoing or "staking" forward so it can even be used in water ? Reminds me of the robot in the movie "Interstellar"....
Or is it used to stabilize when moving against a hard target?
Although I've argued for the Mausoleum at Halicarnassus for the Achaemenid Wonder (being much taller), along the Hanging Gardens as a starting Wonder (both being among the seven Wonders of the Ancient World):