Path Curves in the Plane (3)Curves on the Whole Plane 
The path curves we have so far seen have been confined to a triangular portion of the plane. It is clear that the confinement of the curve is due to the confined nature of the guiding measures for the linepair (actually, the linetriple) that define that curve: a measure started in a segment of a line remains in that segment. Involution, and the Conjugacy derived from it, are the keys to running identical measures in both segments of a line, and we can apply them now to the sides of our invariant triangle—which sides, as we are aware, do not stop at the vertices, because they are lines, and a line does not have "ends" in its list of properties!  
figure I figure II 
animation
Path points lie at the intersections of 'fine' red, gold and blue lines. There are three pairs of conjugate path points:
Path point 1 is common to them all. 

In fact, a triangle covers its entire plane, and divides it into four, triangular regions. The coloured regions traverse the line at infinity: here, (figure I) the white region does not. Thus the linesegments in which now we wish to install measures divide colour from colour, but not colour from white. The involutions are already embedded. To reveal them, we "put in the diagonals", so to speak, of a path point in the white region (figure II). The three cuts, A, B and C, by these diagonals of the triangle's sides must, by Desargue's Theorem, lie in a straight line, and they are, in fact, the conjugate points we seek in the sides. Lines from opposite vertices to them are the stepping lines we need to find the conjugate path points.
We are now in a position to populate the entire plane with path curves! 
Asymmetric (or, symmetry in perspective). 
The same, inverted. These might remind one of the Heart. 
These might be Buds, or Eggs, or Vortices. 
If these curves really do represent real, living forms, then it is of very great interest that the real, physical items appear to "make use" of only half of the geometry available to them—roughly, the half that does not articulate through infinity. Perhaps this is precisely what characterises the physicality of living things. Given that every transformation of space into itself engages all space, freely traverses infinity, and is in a strong sense a unity, it may not be too absurd to suggest that the "other half" remains actively engaged in the formation of living things, but invisibly and hence nonphysically. If it does, then we must consider a new principle, or agent ("agent", because, presumably, it does things), which is almost literally the conjugate of the physical. At any rate, the geometries of the two halves are precisely conjugate. In this connection, please see Nick Thomas on the topic of Space and Counterspace and linkage between them. 
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