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It's just hard to get my head around the fact that they effectively stay true forever then. It makes them even cooler to me now.
Carbon doesn't stretch (plastically) or creep like steel does. If the spokes don't ever change length and the rim cannot deform and there are no spoke heads to come undone, then the wheel can't go out of true.
Imagine the spokes as a flat surface (canopy in the illustration) bounded by the rim which is a rigid hoop (perimeter posts/stays in the illustration). By lifting the centre of the canopy, you create strain which generates tension in the canopy which is reacted by hoop compression in the rim (tension in the guy ropes in the illustration). On Lightweights, the two spoke assemblies are manufactured flat and attached to the rim, then pulled apart at the centre and braced by the hub barrel (centre post in the illustration) which is inserted after tensioning.