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Each moon is home to one of the twelve [[aether]]s; those aethers produce spores, which rain down on Lumar's surface in great, perpetual falls known as [[lunagree]]s. As a result, the entire planet is covered by oceans of aether spores.{{book ref|tress|28}}{{book ref|tress|1}} The seas and moons figure heavily in the local language, with many people swearing by the moons or using phrases like "how on the seas".{{book ref|tress|41}}
Owing to the moons being of equal distance to one another, each sea is of the same size, and roughly the same pentagonal shape.{{book ref|tress|42}} This functions geometrically as twelve pentagons can tesselate the sphere, and due to the shape of the seas and the planet, each sea would border five others, with three around each vertex. The surface is uneven -- each sea is effectively a pile of sand, highest at the lunagree and lower on the border, where spores of the neighboring seas intermingle. However, the sheer size of the seas makes the incline imperceptible unless one is extremely close to the peak.{{book ref|tress|46}} Far below the surface, the seafloor is full of thermal vents that pump out great amounts of air bubbles, along with the decomposition process of the spores{{wob ref|16131}}). This leads to the spores [[wikipedia:Fluidization|fluidizing]], which makes the oceans behave akin to liquid. The locals call this process '''the seethe'''. The seethe usually lasts days; however, it will commonly pause for varying periods of time, known as '''stillings''' leaving all ships sailing across it '''sporelocked''' until it picks up again.{{book ref|tress|8}}{{book ref|tress|12}} During those periods of calm, the ocean is solid enough to walk on, though one must exercise great care when doing so.{{book ref|tress|12}}
Ships on the seas tend to have reinforced bow in order to protect the ship from the thick spores.{{url ref|url= https://www.youtube.com/watch?v=ZOeZAjTR-VY |text= The Science of Magic: Tress of the Emerald Sea |site=Brandon Sanderson on YouTube|name=The Science of Magic}}
The seas are not especially deep, measuring only a few hundred yards at their deepest.{{book ref|tress|51}} There is an entire complex ecosystem of its own at the bottom; however, nothing is known about it.{{book ref|tress|51}} It is a matter of research by [[Xisisrefliel]] and his servants.
The only exceptions to this is the [[Crimson Sea]], infamous for its unpredictable squall patterns. Rainfall there comes unexpectedly and follows random paths, which can be particularly dangerous to sporelocked ships. As such, this ocean remains uninhabited, with few vessels surviving the journey there.{{book ref|tress|35}}
The water cycle on Lumar is very strange and not fully understood, having some relation to the decomposition of spores on the seafloor.{{wob ref|16136}}{{wob ref|16142}}{{wob ref|16131}} It is a point of curiosity and research by [[Xisis]].{{wob ref|16142}}
=== Land and Fauna ===
* The spore oceans came about due to Brandon's fascination with the process of fluidization, as well as his desire to properly introduce aethers into the published Cosmere.{{wob ref|15423}}
* By the time ''Tress of the Emerald Sea'' was written, Lumar's location in the cosmere, and the layout of its star system, had not been established.{{wob ref|15451}}
* The [[Cognitive Realm]] of Lumar is "a little weirder than normal."{{wob ref|16133}}
* After he began envisioning Lumar's fluidized oceans, Brandon watched YouTuber Mark Rober's video [https://www.youtube.com/watch?v=My4RA5I0FKs Liquid Sand Hot Tub- Fluidized air bed] to confirm that the scientific concept was feasible.{{
== Notes ==
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