We get it, we see it: in 1960s television and film, no one was lighter on his feet, no one more effortlessly straddling the comedy/elegance tightrope. A song and dance man like Danny Kaye and Ray Bolger before him, a hyperkinetic vaudeville throwback like his idol Buster Keaton, Dick Van Dyke charmed from every angle of the entertainment polyhedron. Those who don’t envision him as Rob Petrie on his…

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