Within a Minimalist Expanse

Within a minimalist expanse bathed in cool blue and white light, a solitary, deep purple to black sea urchin, its hemispherical domed form bristling with long needle-like spines and marked by a clear ambulacral star pattern, commands the eye as the vibrant color focal point in a low-angle shot looking slightly upwards, captured with a fantastical, animal-centric artistry subtly defined by neutral top-down illumination and a gentle fill light.