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A shadow's sx/sy/kx/ky were applied about the shape's centre with the skew unscaled, so a perspective shadow (algn=b, sy 23%, kx -20 deg) floated in the middle of the shape instead of lying along its bottom edge. As PowerPoint draws it, the shadow is skewed then scaled about the point of the box its algn names (b: middle of the bottom edge, tl: top-left...). Wild synthetic set: shadow alignment/scale/skew slide 5.57 -> 0.41, picture frames 13.71 -> 12.71. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>