That indeed is the question -- but I wonder why some seem not to want there to be...
Science is a process of testing factual correspondence of known actions to an unknown action being investigated:
Opposed forces, check
No direct counteraction, check
Blending opposites without negation, check
Entering/turning in one concept, check
"Opposing forces inside a circle,"
= rotational moment, check
"When one thing moves, everything moves, "
= field action, check
" forces ... dealt with ... on the supported surface"
= boundary phenomenon, check
You would think that eight-factor correspondence might suggest something -- Shame we can't describe and fit that to something we know...