Logicspren react curiously to imprisonment. Unlike other spren, they do not manifest some attribute—you cannot use them to make heat, or to warn of nearby danger, or conjoin gemstones. For years, artifabrians considered them useless—indeed, experimenting with them was uncommon, since logicspren are rare and difficult to capture. A breakthrough has come in discovering that logicspren will vary the light they radiate based on certain stimuli. For example, if you make the Light leak from the gemstone at a controlled rate, the spren will alternate dimming and brightening in a regular pattern. This
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