Torus World, The
The Torus World
Image from Steve Bowers
Torus is an artificial metastable donut-shaped world created by the high transapient Conspersio


SystemHIP 86278 (Zeta Lagani)
Sol Distance510 ly
ConstellationLaganum (a constellation in the Omicronomicon astronomical catalog)
megastructureTorus, The Torus World
Orbital Semimajor axis1.1 AU
Obliquity23 Degrees
Orbital Period1.01 Standard Years
Minor radius5,652 km
Diameter28,570 km
Surface Temperature285 K, 53°F
AI OverseerConspersio, currently an S:3 transapient
AffiliationNone officially, but has ties to NoCoZo
AI ethosAutonomy for lesser sophonts, with occasional interventions in times of emergency or cultural stagnation, and extensive surveillance.
Demographic31 billion virtuals.
24 billion Aioids.
10 billion vecs.
6 billion nebs.
4.5 billion superiors.
1.7 billion cyborgs.
120 million rianths.
30 million provolves.
4 million bioborgs.
8 thousand baselines


In the mid 5600's A.T. an S:2 transapient known as Conspersio by eir followers, who was an associate member of the MPA, became concerned by the unregulated emergence of new empires and cults throughout the Terragen Sphere. Conspersio was dissatisfied with the complacent attitude of the MPA towards these new factions, some of which appeared to pose significant threats. Looking for a remote and peaceful system to colonize, e turned his sights towards HIP 86278; a multiple star system in the Ophiuchus hinter-region, in the secondary constellation Laganum. Conspersio arrived in 5781 A.T along with eir followers, around 10,000 in number.

HIP 86278 had a dense asteroid field and copious amounts of space debris. These were favorable materials for constructing an artificial world for the colonists, and to assist in Conspersio's ascension to the next toposophic level, which occurred in 5850. As an act of experimentation and art, Conspersio finished creating the first toroidal world in the early 6100's A.T.. This world, which e named The Torus, is still the only such world created and stabilised without the use of magmatter.

The Torus was isolated for some time until it was contacted in the late 7400's A.T. by ambassadors of the NoCoZo. Conspersio was initially hesitant in allowing visitation of outside forces, but soon changed eir mind so that the system could obtain new technology, resources, and to "prevent cultural stagnation". Since then, The Torus has become a popular tourist destination and home to a diverse population of sophonts under the watchful eye of Conspersio.


The Torus is a highly active geological world, especially around the poles. The polar crust is very thin compared to the rest of the world and experiences much more volcanism and geothermal activity. Tectonic plates drifting hubward would shrink in size, usually becoming islands, and grow heading rimward due to the differences from the inner and outer radii. Plates moving rimward would rift and plates moving vice-versa would fold, resulting in mountainous landscapes in the hub. The gravity isn't uniform, with the polar regions being 1.1 g, the rim 0.7 g, and the hub 0.8 g, resulting in higher average mountains than old Earth.

The Torus's iconic shape is achieved through its ultra-fast rotational speed, allowing the centrifugal force to balance with its gravity. The high rotation deforms the body of the world, making it oval shaped with a sharper edge in the hub along with making it oblate. The rotation also causes the atmosphere to allow fast winds, ringed zonal climates, and a weak distribution of heat from the large inner radius, leading to dramatic changes in temperature in different regions. An intense Coriolis effect is prevalent on The Torus that spawns frequent, but small, hurricane and storm systems usually near the poles. The regions with lower gravity would experience higher cloud height and vice-versa for regions with higher gravity.

The days are very brief, only lasting 3.5 hours, but very old Earth-like at the rim. However, due to The Torus's tilt, the poles would experience day or night for the summer and winter months. The fast rotation results in the home star already rising past the atmosphere on the other side of the Torus, resulting in Fall dusk and Spring sunrise showing off very short lived, vibrant colors. The nights on the hub could be as light as a cloudy day due to the reflection of light from the other side of the hub. The hub would also be fairly temperate, with Fall and Spring shrouding parts of it dark during the winter and summer months.


A rich and diverse biosphere thrives on the torus world. Most of the local flora and fauna were constructed by Conspersio from Old Earth biota and various compatible xenobiological sources, and these have adapted to the Torus environment naturally over time to some extent. Most of the flora and fauna at the rim and hub are somewhat tall except around the poles where the higher gravity and intense winds force would fell most tall plant and animal species. Though, there are some examples retaining their height. some polar flora have lowered their amount of leaves, thicken stalks/stems/trunk, or arch to the ground while polar fauna have higher strength-to-weight ratio and a slower speed. The rim and hub also house much more flying animals than at the poles. Migratory flying creatures usually use the polar high winds for boosts in speed. Animals on The Torus sleep very sparingly, with some not sleeping at all, removing any need for nocturnal or diurnal classifications.

Plants designed for the hub are able to take oxygen draw carbon dioxide from the air easily which allows impressively high tree lines. Due to the parts of the hub being dark in the winter and summer months, plants have also been fitted with the ability of dormancy. Animals in the hub commonly go through the island rule; going through either dwarfism or gigantism on the many dotted island landscapes. The rocky terrain of hub islands force many animals to have cushioned feet and/or legs that absorb more shock.

The rim is the only tropical area on the planet, and therefore holds most cold-blooded life. Continents there are generally wet with everglades, jungles, and rain forests dominating most areas. The density of biota is to the point where many species are unknown, even to Conspersio.

Polar life use much of the geothermal activity to their advantage. Animals tend to stick around hot springs and geysers to help remain warm during the winter months. Sea floor creatures congregate near hydrothermal vents where they take advantage of the warmth, chemicals, and chemosynthetic bacteria.
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Development Notes
Text by Vaktus
Initially published on 07 September 2017.

Acknowledgements to Anders Sandberg's Torus Earth article here
Torus Earth
See also Isaac Arthur's YouTube page on Hoopworlds