Whatever the spirit of the law, dancing close to, but not over, the line of what's permissible in the law's letter is a daily concern for groups like these.

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Not one person in my eye line was sitting as the star sang Ray of Light while playing the guitar and dancing, (is there anything this woman cannot do?).

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There, the vibrations of salsa music and dancing feet shook the walls as we hopped in line to order at the counter.

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All the while, she played her part and kept herself artfully in line for Ms. Tharp's remarkably rigorous and yet free-seeming presentation of dancing children.

WSJ: Twyla Tharp's The Princess & the Goblin | Atlanta Ballet | The Kids Are All Right | Ballet Review by Robert Greskovic