Rotation: Everything seems to revolve around something, no matter what the scale from atoms to star - planet system to star systems - galactic system.
I would expect to someday find that the complete universe also rotates around something, probably a huge Super Black hole as yet undiscovered.

Gravity: Everything (and I mean every thing from matter to light and beyond) seems to be just variations on a theme.
The theme being vibrations.
I think that all elements are defined by the frequency of their atomic or moleculer vibrations and gravity (an effect?) eminating from a said mass of an element
is probably another as yet undiscovered form of vibration or an effect of the inaction of vibrations.

Whatever.