We assumed that, inside of the icosahedron, some part of it rotated to create pseudo-gravity. So it was a huge gyroscope. When it maneuvered—as it had been forced to, last night—gyroscopic forces must be induced between the spun and despun sections, and those must be managed by bearings of some description. How great were those forces? And how did the thing maneuver, anyway? No jets—no rocket thrusters—had fired. No propulsion charges had detonated. And yet the Hedron had spun around with remarkable adroitness. The only reasonable explanation was that it contained a set of momentum
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