Assertion: optical illusion | /r/CapableOf | magnify the powers of the beast
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text: Perhaps the rapidity of the changes from one of these paces to the other created an optical illusion , which might thus magnify the powers of the beast; for it is certain that Heyward, who possessed a true eye for the merits of a horse, was unable, with his utmost ingenuity, to decide by what sort of movement his pursuer worked his sinuous way on his footsteps with such persevering hardihood.