Generate a monochrome stencil ornament for 3D printing. Visualization: "The wind has written a pattern of speed on a rectangular canvas." Key requirements: Composition: Strict rectangular frame. Inside - a CONTRASTING, FILLED PATTERN. The center must be INTRICATE, DENSE, and COMPLEX, while the frame edges can be simpler. Dynamics & Theme: The pattern must convey SPEED, WIND, and the RHYTHM of a HORSE RACE (without depicting horses). Use: Race Rhythm: Frequent, repeating sharp peaks and wedges, reminiscent of hoof prints. Speed: Long, swift horizontal lines piercing through the entire pattern. Wind: Whirlwinds, spirals, and tight ellipses woven between the lines of speed. Technical Details: STRICTLY: The entire ornament is a SINGLE, UNIFIED entity. All lines are connected to each other and to the frame. The pattern is a through-cut stencil - a single carcass where the background is removed. Avoid simple, monotonous repetitions. Create an illusion of turbulent, chaotic movement confined within the rectangular form. Style: Abstract line art, industrial design.