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== Appearance ==
Spheres are made of small [[gemstone]]s that are set inside glass spheres. The glass sphere is typically the size of a thumbnail while the size of the gemstone inside varies with the denomination.{{book ref|twok|3}} Most spheres are also flattened on one side, to keep them from rolling away when set down. {{book ref|twok|27}} Since gemstones can capture stormlight and glow with this captured light, spheres, by extension, also glow with light.
Only nine of the ten Polestones are used in the spheres,{{book ref|twok|8}} but it is as of yet unknown whether smokestones or heliodor are the gem not used, or the reason for the tenth gem's absence.
== Usage as source of light ==
If left outside during a [[highstorm]], the gemstone inside of a sphere is infused with [[Stormlight]]. Over time, usually around a week,{{book ref|sa3|99}} all of the Stormlight will escape leaving the sphere dun, so it ceases to glow.{{book ref|twok|44}} The amount of light a sphere gives off varies with the denomination: chips barely have any glow at all, marks glow almost as bright as a candle, and broams glow with the light of several candles.{{book ref|twok|3}}
Due to this property of gemstones, infused spheres are often used as a source of light, since the light is renewable and more consistent than candles and lanterns.{{book ref|twok|23}} Though the light given off by a gemstone is reputed to be steady and calm, this is only in comparison to the even more flickering candlelight; [[Kaladin]] observes that the Stormlight inside of a gemstone is actually shifting like a chaotic blowing storm.{{book ref|sa2|22}}
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