time on "spark" -- first, mary sano carries on the spirit and legacy of modern dance pioneer isadora duncan. >> really, she opened up the new era of freedom. >>> then, ron nagle's small-scale ceramic pieces are inspired by hot rods and '50s culture, and his irreverent rock songs have been recorded by some of our biggest pop icons. >> a great song and a great piece of art evoke some form of emotion. >>> and visual artist sandow birk takes puppetry to a whole new level in his filmic adaptation of dante's epic "the divine comedy" -- next on "spark."