A massive vertical limestone shaft plunging deep into the subterranean dark. Stratified limestone walls receding steeply downward into infinite blackness, emphasizing pure vertical drop. Composition: medium shot, looking straight down (nadir angle), featuring Vertical framing looking straight down the axis of the shaft, creating an intense sense of plunging depth. Scientific details: Vertical karst topography, horizontal bedding planes of Cretaceous limestone, fluted rock surfaces carved by acidic water dissolution. Color palette: Pale limestone grays, deep charcoal shadows, damp earthen browns, subtle mineral blues. The complete visual composition must sit comfortably inside the canvas with generous clean white/off-white negative space visible on the left, right, top, and bottom. Keep all important objects fully inside the safe frame. Nothing important may touch or cross any edge of the image. 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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