Most cultures of Earth are at a technology level akin to medieval era. However the technologies available are high-tech. Devices found lost, forgotten and buried in the sub-levels can be as advanced as those imported from offworld. Chemistry is a life-skill held by many.
The following are some of the main materials and resources to be found throughout the City.
durable-rubber substance available in a variety of textures, elastic and liquid. Can be easily produced on home-lab chemi-kits. One popular use is door-seals to make safe-zones. Also called playtex.
Chemical rock that is stored as a liquid, sprayed as a gas that expands into foam upon condensing in air, then sets hard as granite. It is a silicate. Used ubiquitously in construction and for armor and tools (with moulds) since it weighs very little, like plastic. It does eventually decay and can be bored through, but it does not rust like the ancient lower city regions. Most of the city is built of chemstone; hence the environment looking like rotting concrete. Most of the city is constructed of variants of this; it is how it was able to spread and rise skyward on so many levels, within several generations, prior to the Great Plague Times. Chemstone feels like plastic to touch.
Living materials are preferred to inert materials because they self heal and can be grown. Permaculture in the universe of tRust relies upon living fabrics. There are many for this technology affecting all areas of life, from synth-skin dermapatches and cosmetic grafts to functional tools (limpets), breathing fabric, living clothes, neuralinks, door-seals food crops, etc. The industry is huge in the Spaceways however back on Earth only the survival basics are readily available. One popular device is living muscle door-seals that act as environmental protection for sealing off Zones. This can be fitted into an interlocking chemstone shell for security purposes and is superior to the playtex version. Biohab products are living artifacts that are revered as holy by many Life cultists.
Polymorphic digital nano-silicate, applied as a liqui-foam. Gris is a photosynthetic supercomputer. The hardware is programmable from the software and it contains advanced AI so technically it is ‘alive’. The surface emits touch-sensitive 3D holographic shapes. Most of the upper city of the last few generations is constructed of Gris around a chemstone infrastructure. The operating system is a dialect of the picto-symbolic Glyph (known on Earth as ‘Roon’) language of the Spaceways and is called Cogworx. Gris is an unusual third generation form of Biohab technology illegally developed on the ocean world of Ura during Earths slave epoch that has since spread to many other worlds. Gris is unusual because as well as a computer interface it can act as a direct interface with the spirit world. It is black with a marbling effect of sparkly silver shimmering in its infinite depths. Contemporary Architects often train in Gris in preference to the old fashioned infrastructural methods utilising chemstone. Gris feels like cool water to touch.
Biohab is altruistic and holistic. The first generation was illegally developed in the elven ocean world of Ura from where it spread outward; to the production facilities of Nep and the jungle moon Gan, to Mars and then beyond into the Spaceways. Its nature is mutation and its prime directive is indefinite sustainable evolution into ecologies supportive of requirements of life-forms existing within it.