Giant ground screw.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...w_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ound_screw.jpg
Apparently some sort of screw-in support system, whose ease of installation is here demonstrated by a barefoot woman in a red cocktail dress. 5:29 video:
https://www.youtube.com/watch?v=EWGeX4Ip7nU
Previously:
https://www.homemadetools.net/forum/...830#post137104
https://www.homemadetools.net/forum/...440#post122381
https://www.homemadetools.net/forum/...3143#post98162
https://www.homemadetools.net/forum/...102#post100747