Let's go for the plusses first, which are the two performers, Lucy Deacon and Moritz Linkmann, who work together as Strangebird Zirkus.

They make back-flipping acrobatics and scaling the vertical height of a Chinese pole look as effortless as walking; but more than that, they share a flair for expressively nuanced clowning and spot-on comic timing. When you ally those skills to the acts of aerial prowess, the potential for storytelling on several levels really gets off the ground, as it were.

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