Circumstension:
Defination
it is that type of special physical force which acts on a object then make it spherical.
Reason
The reason behind is, when a force acts on the center of a body then it splits in all directions so the figures made by this type of force is always a sphere
e.g.
the making of bubble is based on this principal then where gases act at center.
Discovery
it is discovered in 1985 by Matt Williams in U.S.