Axis
An axis is a conceptual or real line in architecture that helps define the placement of other design elements
An axis is a physical or visual line that defines the placement and orientation of a structure. Symmetrical objects have a single centered axis, several axes define the location of objects in a two or three dimensional plane. An axis does not have to be centered, but can be the point of rotation for all the elements around it.
An axis can be a conceptual straight line that defines where the rotation of objects or structures occurs.
The illusion here is that this home's three levels rotate on a center axis.
This pivoting television has a real center axis, a pole allowing it to turn toward either side of the partition. The equal sides of the television on either side of the axis are symmetrical.
The axis pole of this pivoting entry door is off center. The axis of a normal hinged door is the extreme edge where the door meets the jamb.
This fountain is located on an invisible axis that centers it directly through the arch and continues towards the lawn.