The ultimate units, Kant’s sphaera activatis, are terminal concentrations of energy that stretch out as active dimensional spheres. This insight matches current theoretical physics. In current particle physics, string theory conceives of force-points as closed vibrating loops that whip their exteriors into dimensional shape. Force generates extension—even on the level of elements. From what science can tell today, the resulting dynamic spacelets, so-called Calabi-Yau spaces, are the smallest extension units of reality.