What does a spinning naked singularity look like from the outside?

Spinning objects that exceed the black-hole spin limit — called superspinars or naked singularities — cast shadows with shapes distinct from ordinary black holes, but only noticeably so when the cosmological constant is artificially large. For realistic cosmic conditions and objects as massive as anything in the known Universe, the shadow differences fall below what instruments like the Event Horizon Telescope can resolve. The result sets a practical observational ceiling on testing these exotic alternatives to black holes.