¶ Yin-yang (1)
Index Entry
Yin-yang:
"Goldy tries putting a light inside a translucent tetrahedron. Next she encloses the translucent tetrahedron inside a translucent plastic sphere. The light at the system center casts the shadow lines of the tetrahedron’s six edges outwardly and symmetrically onto the plastic sphere to produce the outlines of a spherical tetrahedron. Goldy draws circles around each of the spherical tetrahedron’s four corners of such a unit radius that each of the four circles is tangent to each of the three others. Using a sharp-edged cutting tool, she severingly follows around the perimeter of one circle to its point of tangency with the next adjacent circle, and there she inflects her cutting tool to follow around that next tangent circle to its next point of tangency, where she once more inflects her cutting tool’s severance-trace to follow around the next circle to reach the next tangent point; which procedure she repeats until finally returning to the point of origin.
“She completes the severance and cuts the spherical tetrahedron’s surface apart in two similar equi-area sections, each of which corresponds to the two similar, dumbbell-profiled, skin sections of a baseball. With these two similar, half-a-sphere-surface”
