  In 1978, John McKay made an intriguing observation: 196884=196883+1.
Monstrous Moonshine is the collection of questions (and a few answers) inspired
by this observation. Like moonlight itself, Moonshine is an indirect
phenomenon. Just as in the theory of moonlight one must introduce the sun, so
in the theory of Moonshine one should go well beyond the Monster. Much as a
talk discussing moonlight may include a few words on sunsets or comet tails, so
will we see snapshots of the Theory of Generalised Moonshine.
