iVoyeur: BPF and Histograms

Argus Panoptes was the all-seeing primordial giant and slayer of the mother of all monsters, Echidna, in Greek mythology. In some tellings he has 100 eyes, some combination of which are always open, though the Renaissance painters (perhaps to save on paint?) always depict him with just the two.

Whether he was a many-eyed giant or merely a very astute, tall man, his powers of observation were so legendary that Hera herself entrusted to Argus the task of guarding the promiscuous nymph Io (inexplicably disguised as a cow) in order to keep her away from Zeus, Hera's unfaithful husband and king of the gods.