"Punch"'s Representation of Algol, "An Astronomical Reprobate". Original "Punch" caption: "The star Algol behaved in a most ill-bred manner. He would advance, wink, and then retire. For years his motion and behaviour puzzled astronomers, until at last the mystery was solved by Professor Vogel, who showed that Algol had associated with him a dark star, which was invisible, and that the latter sometimes obscured the former. Algol and his invisible playmate revolved round each other, and this accounted for the fact that Algol seemed to us to wink." "Sir Robert Ball's Lecture at the Royal Institution".