A Bauhaus-style flat colour-block poster that is secretly a deep box city. A slice-and-dice partition tiles the frame with varied rectangles; each becomes a box extruded to a random depth while keeping its poster cell exactly, so an orthographic camera head-on tiles the blocks with no gaps into a perfectly flat graphic. First the still poster holds; then a raking light sweeps across and cel-quantised edge shadow catches the block seams with a held-breath micro tilt; then the camera orbits out and the poster shears into a parallaxing three-dimensional city of blocks and floating accent discs; then it glides back and everything re-flattens into the poster. On the sketch’s own page, drag to orbit the box city yourself — release and it springs back flat.