Few ballerinas are as adventurous as New York City Ballet’s Wendy Whelan. “I like to be the paint and the brush,” she says, “but just not the person holding the brush.” At the Guggenheim’s Works & Process this weekend, Whelan discussed and performed excerpts of "Restless Creature," a suite of duets created collaboratively with contemporary dancer-choreographers Kyle Abraham, Joshua Beamish, Brian Brooks and Alejandro Cerrudo.