A pitch-black subterranean space untouched by light rays. A complete absence of downward-drifting organic detritus, emphasizing a closed system. Composition: medium shot, eye-level looking slightly upward into the dark void, featuring A symmetrical, heavy composition focusing on the enveloping darkness, framed by massive, damp cave walls that converge toward the center. Scientific details: Absolute absence of photosynthetic light sources; damp, smooth limestone surfaces slick with condensation; zero particulate snow from upper layers. Color palette: Deep charcoal grays, muted earthy browns, obsidian blacks, and wet stone highlights. The complete visual composition must sit comfortably inside the canvas with generous clean white/off-white negative space visible on all four sides: left, right, top, and bottom (target 8-12% margins, minimum 6%). The main illustration must occupy maximum 80% canvas height and 84% canvas width. Never stretch vertical geological columns, shafts, planetary spheres, magma conduits, or tall objects to touch the top or bottom boundaries; scale the entire illustration down inside the safe central canvas. Keep all important elements fully inside the safe frame. Nothing may touch or cross any canvas edge. Do not crop the primary subject. Do not use edge-to-edge artwork. Do not fill the entire frame with background scenery. hand-drawn 2D explainer cartoon illustration, thick clean black outlines, simplified readable forms, flat cel-style colors, soft minimal shading, clean educational YouTube illustration, clear focal hierarchy, no photorealism, no 3D rendering, no typography, no text, no watermarks
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