To Bob these artifacts were only moderately strange, and he learned to overlook them after a few moments' nervous glancing around the room. What really paralyzed him was the omnipresent noise – not because it was loud, but because it wasn't. The room contained at least two dozen clocks, or sub-assemblies of clocks, driven by weights or springs whose altitude or tension stored enough energy, summed, to raise a barn. That power was restrained and disciplined by toothy mechanisms of various designs: brass insects creeping implacably around the rims of barbed wheels, constellations of metal stars hung on dark stolid axle-trees, all marching or dancing to the beat of swinging plumb-bobs.