A Hub is a kilometer spanning sky-arcology.

Usually these are seen together with other sky arcologies (a Hub and 3 sectors), a cloud gate and sky infrastructure to form a Theme Zone. The Hub represents the central point of a Theme Zone with the three sectors arranged around it and connected between them with a sky-rail system.

It provides residential spaces, but also is a mass transit node for travel and transportation within the Theme Zone but also as a destination for transport arriving from outside the Theme Zone.

The main feature of the Hub is it's residential area. Each has spaces for Theme Zone Hub Apartments.

History

Theme Zone Hubs are the central nucleus of a Theme Zone and probably were conceptualised, designed and first built in the same period as Theme Zone Sectors, somewhere between 1906 (discovery of genesium) and prior to 1962 (start of Calido Sector refurbishment into Calido Valley mega Dome).

It is still a matter of debate if there was a previous generation of sky arcologies that were not specialised into Theme Zone Sectors and Theme Zone Hubs. This earlier generation might have combined the functionality of the hub with the sectors, but once modern Theme Zones were established we see the current specialisation of Theme Zone sky-arcologies into sectors and a hub.

As of this time it is not known if new theme zone hubs are being actively built anywhere in the world, if new ones are prohibitively expensive to build nowadays or if the know-how to build them has been lost.