Collaborations can bring out the best in artists working together from different disciplines. But Sutra, which reunites the Belgian choreographer Sidi Larbi Cherkaoui and the British sculptor Antony Gormley in this new Sadler’s Wells production, exceeds even our highest expectations. It forms a dazzling alliance of space and content that grants kinetic life to Gormley’s art and conceptual discipline to Cherkaoui’s philosophical choreography.