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Otherwise referred to as the Thing in the Cellar, this is the Hex analogue, independently devised by Hubert Turvy to precisely replicate the circulation of money in Ankh-Morpork.

Annotation

As TP himself points out in the Author's Note to Making Money, this is directly taken from Roundworld's Phillips Economics Computer, a bizarre but effective water-powered machine [1] devised in 1949, but which was so good at reproducing an economic cycle that the last of the Phillips machines were still going strong in economics schools in the early 1990's - when orthodox computer power had finally caught up with hydrology, and could at last replicate what the machines had been doing for nearly fifty years. The operators must have cheered this, as they could finally hang up the oilskins and sou'westers they had needed to wear indoors. The MONIAC[2] - note one significant letter away from being a MANIAC - was also, with superb Discworldian ontology, called a Financephalograph.