The minimal opening/portal/void is 2D triangle
/\
jellyfish{ lamprey } --oldest animal species on Earth-- use
one opening;
for food entrance,
waste and,
sexual reproduction.
Since they have only one opening they are not a torus. A torus has hole that goes through the torus leaving a tube around the hole.
Jellies propel themselves by sucking the body INward and that causes water to be pushed OUTward. Pulling-INward{ contraction } is the fundamental/essenstial phenomena of Universe.
Suction{ pulling-IN } leads to expulsion{ pushing-OUT }
See link
When weather person states NE blowing, it is more correct to say there is a SE sucking.
Our brain sends only one signal to the muscles and that is to contract INward. The uterus contracts INward and the baby is pushed OUT-ward
More complex humans are single or multiple holed torus.
SPACE (>*<) i (>*<) SPACEi.e. fundamental/essence of "G "od/"U "niverseand it sub-catagorical parts.
Earths EMField is toroidal tho it is unclear we can there is and actual hole. it
( )hole( ) vertical bisection of torus or as (( hole )) horizontal bisection of torus.