Ex Nihilo's Cuir Celeste Par Mathieu Cesar is a unisex scent with leather notes, introduced in 2018, and crafted by the perfumer Quentin Bisch. This fragrance opens with a composition of violet leaf, galbanum, black pepper, and sage as its top notes. The heart of the fragrance blooms with a delicate blend of ambrette (musk mallow), tea, jasmine, and osmanthus. The scent settles into a rich base of ambrette (musk mallow), white musk, leather, akigalawood, cypriol oil or Nagarmotha, and patchouli.