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Something obvious but oftentimes overlooked or discounted is the aptitude to learn choreography quickly. Of course, the most spectacular of dancers can afford to lack this ability, but the rest of the dance world cannot, and the absorbent, focused dancer is universally appreciated. To learn quickly is another of those less conventional attributes that can be useful in achieving success as a dancer, especially if that dancer does not stand out in other ways.
Just as the actor has to trust him or herself in the choices they make, so does the casting director. Playing it “safe” on either side of the camera just isn’t interesting enough.