Oblate golden rhombohedra are a type of nanostructure studied for their potential applications in a variety of fields, including optics, electronics, and catalysis. Gold nanocages are made by chemically etching away the core of a gold nanoparticle, leaving behind a hollow structure with the shape of an oblate golden rhombohedron. Artistic process: Mathematica (Wolfram demonstrations project), Midjourney (AI program), PSD