"SISYPHEAN CIRCLE (sagitta)"
2012, slate/ pigmented and sealed steel, 22.5h x18"w x4.5"d
private collection: California
The name comes directly from Latin sagitta , meaning an arrow.
In geometry , the sagitta (sometimes abbreviated as sag  ) of a circular arc is the distance from the center of the arc to the center of its base.  It is used extensively in architecture when calculating the arc necessary to span a certain height and distance and also in optics where it is used to find the depth of a spherical mirror or lens.