Crystallography

This composite SEM–BSE image captures the calcium metal counter electrode surface after stripping during the evaluation of emerging calcium battery technologies. Blue–green gradients indicate light elements (C, O, and F), while red denotes Ca. Two closely spaced pits appear to merge, forming a microcosmic convergence. This morphology reveals pronounced interfacial heterogeneity, challenging the common assumption of a homogeneous counter electrode.

The image shows seven pieces of Persimmon cut and arranged in a compact, high-efficiency hexagonal pattern.

Each persimmon, in turn, exhibits octaradial symmetry in cross-section: when cut horizontally, its interior may reveal an eight-pointed star-shaped structure resembling a kaleidoscope and evoking Tartessian symmetry motifs.

This pattern is a natural example of radial symmetry and has morphological analogues in certain crystal growth structures.