  We perform real-time stereoscopic wide-area imaging of a ferroelectric
phase-transition in KTN:Li. Spontaneous polarization is observed to form a
thermally hysteretic 3D lattice of mutually interlinked closed-flux patterns
that spans the entire sample. Results are compatible with a supercrystal of
$N=4$ topological texture defects arising as the three-fold spatial and
one-fold time-inversion symmetries are simultaneously broken. Each lattice site
of the texture supercrystal emerges as the projection in actual space of an
S$^3$ hypersphere, an extended volume Hopf-link fabric able to screen both
volume charge and ferroelectric strain.
