It is difficult to explain to people exactly what an art quilt is and can be. This blog post which reviews a recent SAQA exhibition does a good job of inviting viewers to consider quilts, using the SAQA definition*, as art.
The selection process for the Earth Stories show invited artists to identify a person or organization that "enhance the planet, make a significant difference in restoring and/or protecting the environment, increase sustainability and otherwise improve the earth we all occupy." Artists were selected based on their portfolio and their theme proposal. It appears that each artist made two pieces and that the juror chose one for the show. This selection method offers artists much more freedom to create something that truly conforms to their vision. They need not second guess the juror or be concerned that their excellent work might be rejected because the juror needed to create a balanced show or one that elucidated themes of his or her own.
* ART QUILT: "a creative visual work that is layered and stitched or that references this form of stitched and layered structure."