  To understand the true nature of black holes, fundamental theoretical
developments should be linked all the way to observational features of black
holes in their natural astrophysical environments. Here, we take several steps
to establish such a link. We construct a family of spinning, regular black-hole
spacetimes based on a locality principle for new physics and analyze their
shadow images. We identify characteristic image features associated to
regularity (increased compactness and relative stretching) and to the locality
principle (cusps and asymmetry) that persist in the presence of a simple
analytical disk model. We conjecture that these occur as universal features of
distinct classes of regular black holes based on different sets of construction
principles for the corresponding spacetimes.
