In the best gothic/steampunk tradition, the Igorrery is a Frankensteinian confection of polished brass spheres, ebony rods, glass insulators and unprotected knife switches.
The circular base of the Orrery contains a Wimshurst disc, the rotation of which is produced by any of a crank handle, a large
clockwork mechanism, a falling weight, or a minature steam engine (with a Watts governor on top).
As the "planets" orbit the Sun, they accumulate massive static charges, positive or negative; as they pass close to one another, huge sparks leap from planet to planet as the breakdown voltage of air is exceeded and the charges equalise themselves.
The "Sun" can be a gas-discharge sphere, or a radiometer, or contain a neat little Jacob's Ladder spark discharger.
The orrery, in operation, is enveloped in an eye-watering purple glow of UV and brush discharge, and a nose-watering stench of ozone. It is impossible to operate any modern electronic device within a radius of 100 metres due to the huge amounts of random RF the orrery emits.
Attempting to adjust the unit when it is operating may result in severe electric shock, superficial burns, eye damage, hearing loss, neurological impairment and breathing difficulties.
The whole apparatus stands on a polished mahogany and rosewood table, and comes complete with a hunchbacked, dwarfish, disfigured eastern european attendant with a speech impediment, poor hearing, and bad eyesight, or alternatively Leonardo Di Caprio.