Mysterious vintage steampunk fantasy style, 45-degree top-down central triangular composition, shallow depth-of-field macro still life, hyper-realistic 3D sci-fi CG rendering, in the style of Greg Rutkowski's fantasy mechanical props. A transparent crystal square cube with gilded edges, all six faces covered with intricate circular vintage mechanical rune circuits. The cube emits an internal glow with a gradient from brownish-red to warm gold. It rests on a matte cold-black ground scattered with dark crushed sand, with part of the cube half-buried in the surface. The background features a deep blue blurred bokeh. The deep blue base is paired with a striking warm-cool color clash of brownish-gold. Illuminated by Rembrandt lighting, showcasing a highly transparent glass texture with subsurface scattering (SSS). 8K ultra-HD, cinematic still-life photography.