The torus is a three dimensional figure created by rotating a circle 360 degrees along a line formed by another circle. This is also known as a donut or bagel shape. The hole is one ‘inside’ and the interior of the donut (like the inside of a tire tube) is another ‘inside’.
These are static structures.
We can also imagine a toroidal shaped electromagnetic field generating a torus shape
like this heart-centered one from
Asianhealthsecrets.com.
“The Hearts’ torus electromagnetic field is not the only source that emits this type of electromagnetic field. Every atom emits the same torus field. The Earth is also at the center of a torus, so is the solar system and even our galaxy…and all are holographic. Scientists believe there is a good possibility that there is only one universal torus encompassing an infinite number of interacting, holographic tori within its spectrum.”
Here is a larger torus centered on Jupiter and its moon, Io. 
” Io’s volcanoes continually expel an enormous amount of particles into space, and these are swept up by Jupiter’s magnetic field at a rate of 1,000 kg/sec. This material becomes ionized in the magnetic field and forms a doughnut-shaped track around Io’s orbit called the Io Plasma Torus.” (planetaryexploration.net)
Here is one with a vesica pisces! Very cool! The original, by artist and planetary healer Pamela Leigh Richards is quite dynamic. (http://flywithmeproductions.com/blog/wp-content/uploads/2009/08/torus1.gif.
Another cosmic one appears in the current edition of National Geographic 
(July 2013) in an article on the origins of the solar system. This side oriented torus represents the Oort Cloud’ a collection of trillions of comets and mini planets toroidally spinning around the solar system, seen here in red.
This reminded me of Itzak Bentov’s torus describing his model of the whole cosmos.
This can be found in both “Stalking the Wild Pendulum” and “A Cosmic Book, for those who want to look a bit more deeply into this.
And, for the piece de resistance, I offer the first cell division, where a single cell becomes two cells.
Notice the energy flow and the opening of the toroidal field as the poles (centrioles) separate. For your cosmic homework, as you sit in your favorite pose, Find your heart in the center and visualze the heart’s electro-magnetic field. Find the 1st chakra and open it to the earth’s energy. Find the 7th chakra opening to the heavens. Then allow the heavens to pass through the donut hole into the earth and the earths energies to pass through you to the heavens. Find the balance of stability (sthira) and flow (sukham) as the torus links your atoms to the cosmos and vice versa.
Then explore the energetic shift from one cell to two and then the reverse, from two to one. Develop some flexibility in both directions. Find the torus and the vesica pisces. We will build upon this in upcoming embryology sections.
And most importntly, Smile. Enjoy the show. And, to quote the poet Mary Oliver, ‘Pay attention!, Be astounded! Tell about it!