| The geometry of the house is based on that of an elliptical toroid. |
| It is an asymmetrical oval slice of toroid, tilted out of the ground towards the south to catch the sun's heat. |
| When stretched at fixed displacement, the toroid undergoes a transition from an ellipse to a tadpole regime. |
| They found that instead of polarization, the new phase creates what the researchers call a toroid moment, which rotates in a circular fashion like a vortex or a tornado. |
| The toroid adds additional optical power in the vertical direction to bring the two focal planes together. |
| Here we examine this in detail, first looking at the case of a circular toroid deformed into an ellipse. |
