lasses:
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 * POINTS
   + FRAME(1:2)   coordinates

 * CIRCLES
   + FRAME(1:2)   center
   + FRAME(3)     radius

 * ORIENTED CIRCLES
   + FRAME(1:2)   center
   + FRAME(3)     radius
   + FRAME(4)     orientation

 * ELLIPSES
   + FRAME(1:2)   center
   + FRAME(3:5)   S11, S12, S22 such that ELLIPSE = {x: x' inv(S) x = 1}.

 * ORIENTED ELLIPSES
   + FRAME(1:2)   center
   + FRAME(3:6)   stacking of A such that ELLIPSE = {A x : |x| = 1}
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