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In page Clare College, Cambridge:

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Fourteen stone balls decorate it, one of which has a missing section. A number of apocryphal stories circulate concerning this – one cited by members of the college is that the original builder of the bridge was not paid the full amount for his work and so removed the segment to balance the difference in payment. A more likely explanation is that a wedge of stone cemented into the ball as part of a repair job became loose and fell out.[citation needed]