Once her mycelium, the root-like structure of fungus that produces mushrooms, mimics the rind of a soft-ripened cheese, Rosenkrantz dehydrates it into a lightweight, biodegradable building material, in this case, the body of a guitar.

The musician, trained as an industrial designer, embarked on her career as a luthier, or maker of string instruments, about a decade ago, and over the past several years has integrated mycelium and other biomaterials in her quest to create more environmentally friendly, plastic-free instruments.

Rosenkrantz chuckles as she delivers her brie analogy that's also a nod to her French roots; the designer was raised in Montfermeil, an eastern suburb of Paris, and now resides near Providence, United States, where she teaches at the prestigious Rhode Island School of Design.

The basement atelier below her sunny apartment full of plants and books is home to her craft and doubles as a science lab, where she creates materials like kombucha leather to make banjo heads, and uses fish leather to make pickguards.

"In the design world, everybody's working with biomaterial, it's exponential," the 42-year-old told AFP from her workshop. 

"It's not, like, a hippie solution anymore," she continued, pointing to BMW, which has used flax fiber in dashboard construction, or Hermes, which has used mushroom-derived leather in their purse linings.

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