A clean whiteboard-style explainer video on a pure white background. A realistic human hand with a black marker quickly draws a full educational illustration from start to finish in real time. The drawing is created progressively, stroke by stroke, as if hand-sketched live. The scene fills one full page during the entire 10-second video and finishes completely by the end. The illustration is about algorithms and data structures: flowchart arrows, connected logic blocks, array grid, stack blocks, queue arrows, binary tree nodes, graph network, code symbols, all arranged in one balanced academic composition. Black outline drawing, neat doodle style, simple and clear, no color fill, no extra pages, no camera cuts, no zoom, no transitions, static top-down view, smooth hand movement, education
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