X(6), X(2086), X(2087), X(2088)
X(6) acnodal point
vertices of cevian triangles of X(1) and X(6), see figure below
A', B', C' :feet of the anti-orthic axis
Consider a circum-conic passing through a point F on the circumcircle and its isogonal conjugate F*. This conic is clearly the isogonal transform of the line FF*. When F traverses the circumcircle, the locus of its perspector is K215.
If f denotes the transformation which associates to P the intersection of the trilinear polars of P and P* then K215 is the image of the circumcircle.