The Original Drawings:
Tai Chi

The points along the North-South axis of the drawing are, from the bottom, planetary distances represented correctly to scale. Seen this way they seem to be a chaos as no relationship is apparent.

But look what happens when the planetary distances are swung with a compass to the circumference of this circle!  (Its radius is the .75 power of the radial orbital distance of Venus, which is the geometric average between the periods of orbit of the first two planets.)

Lo and behold, the distances along the circumferences now are perfectly aligned to describe seven points of a decagon, and they de-mystify both the Tai Chi or Yin-Yang symbol, and the pentagon!