A double-ariel requires weeks of complete concentration to achieve perfection. Micke Johansson works with extreme precision, as the margin for error throughout the process is minimal. "It only takes an open door letting in a cold draft at the wrong moment, and the hot glass mass risks cooling in a way that could cause the entire piece to explode," explains Micke Johansson.

The Ariel technique, developed in the 1930s at Orrefors by Gustav Bergkvist, was inspired by the air spirit Ariel from Shakespeare's play *The Tempest*. In the ariel technique, patterns of enclosed air are created by rolling the glass in several layers where sandblasted patterns trap air. This results in floating patterns within different layers inside the solid glass. A double-ariel means this advanced technique is applied twice, further deepening and enhancing the visual play of layers and light in the glass.